rhinoceros beetle (esp. the Japanese rhinoceros beetle, Trypoxylus dichotomus)
pillbug; pill bug; woodlouse; sowbug; sow bug; slater
hornworm (caterpillar of a hawk moth); (hairless) caterpillar
ladybug (Harmonia axyridis); ladybird
scarabaeid beetle; Mimela splendens (metallic-green scarabaeid beetle)
ground beetle; carabid (esp. of superfamily Caraboidea, but excluding subfamily Carabinae); Anisodactylus signatus (species of ground beetle)
Paramecium spp. (esp. Paramecium caudatum)
jewel beetle (esp. Chrysochroa fulgidissima); buprestid
bloodworm (Halla okadai, species of eunicid worm used as fishing bait); red mite (Trombicula akamushi); chigger mite; harvest mite
aphid; plant louse; cockroach; Japanese house bat (Pipistrellus abramus); hanger-on; parasite
bell cricket (Meloimorpha japonicus); (arch.) pine cricket (Xenogryllus marmoratus)
dung beetle; gold beetle; goldbug; maggots in faeces (feces)
hunchback; humpback; crookback
leaf beetle (of family Chrysomelidae)
euglena (freshwater flagellate)
wood louse; wood lice; slater
any horsehair worm of class Gordioidea; gordian worm (of class Gordioidea); hair worm (of class Gordioidea); wireworm (click beetle larva)
inchworm; measuring worm; looper (caterpillar)
hairy caterpillar; woolly bear; pest; nudnik (nudnick)
click beetle; skipjack (beetle of family Elateridae)
cabbageworm (caterpillar of the cabbage white butterfly)
Mecopoda nipponensis (species of katydid)
pine cricket (Xenogryllus marmoratus); (arch.) bell cricket (Meloimorpha japonicus)
heartburn; strong sense of disgust
dobsonfly or stonefly larva
rhizocephala (parasitic barnacles)
bed bug (Cimex lectularius); bedbug
caddis worm; caddis-worm (caddisfly larva)
leaf insect (esp. species Phyllium pulchrifolium)
bark beetle (Scolytidae spp.); gribble (Limnoria lignorum)
harvestman; daddy longlegs (arachnid of order Opiliones)
ringworm (of the body); tinea corporis
ribbon worm (any worm of phylum Nemertea)
bombardier beetle (esp. species Pheropsophus jessoensis); stink bug
Chinese wax scale insect (Ericerus pela)
worm-eaten; moth-eaten; holes eaten in clothing, leaves, etc. by caterpillars, moths, etc.; leaf warbler (any bird of genus Phylloscopus); chiffchaff
athlete's foot; water boatman (esp. species Hesperocorixa distanti); Asellus hilgendorfi (species of aquatic sowbug)
insect catching; bug catching
aquatic insect larva (esp. of caddisflies, mayflies, etc.)
kanji "insect" radical at left
springtail (wingless insect of the order Collembola)
cochineal insect (Dactylopius coccus)
Notonecta triguttata (species of backswimmer)
pseudoscorpion (any arachnid of order Pseudoscorpionida); false scorpion
acorn worm (any hemichordate of class Enteropneusta)
bombardier beetle (esp. species Pheropsophus jessoensis); stink bug
biting louse (any louse of order Mallophaga); small winged insect (esp. a flying ant or termite)
roundworm (Ascaris lumbricoides); mawworm; (metaphor for) location of one's feelings or sentiments; (metaphor for) empty stomach; feeling of hunger
peanut worm (any worm of phylum Sipuncula)
insecticide; insect repellent
faint breath; dying whisper; at death's door
undesirable lover (boyfriend, girlfriend); passion; temper; irritability
singing of insects (esp. in autumn); sound of insects
someone who gets in the way without serving any useful purpose; fly in the ointment; buttinsky; third wheel
calls and sounds made by insects
magnifying glass; wrestler of the lowest rank
bookworm; bibliophile; bibliophage
snake in one's bosom; treacherous friend
insect bite; bug bite; sting
small insect; midge; vermicule
scarabaeid beetle grub; any insect (or worm, etc.) that lives in soil
rushing to one's doom; (like a) moth flying into the flame
money loser; high-cost, low-return project
caterpillar fungus (esp. Cordyceps sinensis)
flies that appear in Tohoku and Hokkaido in late autumn or early winter (esp. the woolly apple aphid); flies that appear above fallen snow in the early spring (esp. certain species of small winter stonefly and true crane fly)
bur (prickly seeds or seedheads that stick to fur and clothes); burr
deworming medicine; anthelmintic
summer insect; summer insects
some prefer nettles; there's no accounting for taste; every man to his taste
pin (esp. for mounting insects); setting pin
caterpillar (esp. hairless); person with scanty supply of clothes
tread on a worm and it will turn; even a tiny bug will defend itself; even the weakest and smallest beings have their own wills, so do not make light of them
convulsions (in a child); nervousness; short-temperedness; bug thought to cause children's diseases
torch procession to drive away crop-eating insects
workaholic; person who is totally devoted to his work
moss animal (any animal of phylum Bryozoa)
ground beetle; carabid (esp. of subfamily Carabinae); (arch.) millipede
diligent student; drudge; swot
mushi-ken; Japanese rock-paper-scissors variant, in which the "frog", "snake" and "slug" are represented by the thumb, forefinger and little finger respectively
to sacrifice something small in order to save something great; to lose a leg to save one's life; to kill a small bug and help a large one
incantation to rid a child of insects traditionally believed to cause disease; charm to cure colic, tantrums, etc.
to sacrifice something small in order to save something great; to lose a leg to save one's life; (lit.) to kill a small bug and save a large one
first spring thunderstorm of the year
Marphysa sanguinea (species of eunicid worm)
stinky bug (esp. the bombardier beetle); stink bug
bur (prickly seeds or seedheads that stick to fur and clothes); burr
Protura (order of wingless insects)
ghost walker (beetle) (Mormolyce phyllodes); violin beetle
velvet worm (Onychophora)
schizomid (any arachnid of order Schizomida)
lace bug (any insect of family Tingidae)
inocelliid snakefly (any insect of family Inocelliidae)
phoronid (any wormlike animal of phylum Phoronida)
tongue worm (any worm of phylum Pentastomida)
beard worm (any worm of phylum Pogonophora)
vestimentiferan (any tube worm of order Vestimentifera)
arrow worm (any worm of phylum Chaetognatha)
viburnum; Viburnum furcatum
Protura (order of wingless insects)
proturan (any wingless insect of order Protura)
flatworm; flat worm; flat bark beetle
Bothrogonia ferruginea (species of leafhopper)
ghost walker (beetle) (Mormolyce phyllodes); violin beetle
wooly apple aphid (Eriosoma lanigerum)
children's medicine for nervousness; snack for an empty stomach
nymph (immature form of an insect)
true bristletail (any insect of order Thysanura, esp. of family Lepismatidae)
true bristletail (any insect of order Thysanura, esp. of family Lepismatidae)
Protura (order of wingless insects)
xenoturbellan (either of two species of worm-like basal deuterostomes)
mythical spirit residing in a person's body that generates a desire to drink (also said to turn water into alcohol)
someone who curls up under a kotatsu all winter; kotatsu bug; kotatsu snail
mushifuda; stripped hanafuda deck consisting of 40 cards
insect peddler (esp. fireflies and crickets)