oil; petroleum; oil; lubricant; (cooking) oil; (massage) oil; ointment
may; might; perhaps; may be; possibly
exactly; precisely; just; as if; as though; quite
contacting; getting in touch; communication; call; message
as a matter of fact; by the way; to tell you the truth; to be honest; frankly
investigation; examination; inquiry; enquiry; survey
being in charge (of an area of responsibility); being responsible (for a work role, etc.)
professor; teaching; instruction
story; tale; talk; discussion
ability; performance; efficiency
making efficient; optimization
speciality; specialty; subject of study; expert; area of expertise
study; research; investigation
relation; relationship; participation; involvement; influence; effect
please; somehow or other; one way or another
color of water after washing rice (colour)
direct; immediate; personal; firsthand
request; commission; entrusting (with a matter); dependence; reliance
to change; to alter; to reform; to correct; to examine; to check
confirmation; verification; validation; review; check; affirmation
to take; to pick up; to pass; to hand; to get; to obtain; to adopt (a method, proposal, etc.)
in appearance; to look at; judging from appearances
indicates word or phrase being defined; used for quoting (thoughts, speech, etc.); with; (not) as much as; (not) so much as; the fact that
unrelated; irrelevant; unconcerned; unconnected
you; buddy; monarch; ruler; he; she
possibly; apparently; (seem) likely; somehow or other; with difficulty; barely
flaw; defect; problem; inconvenient
good; advantage; sake; purpose; consequence; result
preparation; arrangements; provision; getting ready; laying out (e.g. a meal)
distinction; difference; separate; different; exception; exclusion
sample; example; specimen; display model (e.g. plastic food models used by restaurants)
appearing ...; looking ...; way to ...; method of ...ing; form; style
that's the way it is; yes; is that so?; is it?
(not) anything; (nothing) at all; and everything else; and all; (not) at all; (not) in the least
question (e.g. on a test); problem; problem (e.g. societal, political); question; question (i.e. doubt); public discussion
nonexistent; not being (there); unowned; not had; unique; not; impossible
after all; in the end; conclusion; end; end of a game of go, shogi, etc.
overanxiety; needless worry
trouble; bother; annoyance