kernel; core; nucleus; center; centre
patent; special permission; licence (license); proprietary
now that you mention it; come to think of it; that reminds me; on that subject; speaking of which
intelligence; genius; scholarship; virtue
promotion (school, military, etc.)
to change; to alter; to transform; to reform; to revise; to amend
register of names; list of names; roll; register; roster
inspection; reading; perusal; browsing (the web)
examination; exam; test; trial; experiment; test
cool (temperature, color, etc.); cool (i.e. calm and collected); cool (i.e. fashionable, attractive, etc.); course (of medical treatment); season (series) of a television program (usu. 13 installments over a 3-month period)
magnification; leverage; amplification; competitiveness rating (e.g. for university entrance); applicant-to-acceptance ratio
competition; contest; rivalry; competition (between organisms or species)
suddenly; casually; accidentally; incidentally; unexpectedly; unintentionally
curiosity; inquisitiveness
to re-think; to think back upon; to change one's mind
mark; symbol; to mark; to put a mark on; trademark; paying attention to; focusing on
student preparing for or taking examinations (usu. entrance exams); test-taker
this and that; this or that; one thing or another; this way and that
entering a higher-level school, esp. going on to university
to grant permission; to give permission
to have a talk; to tell a story
door; gate; opening; title page
peace preservation; security; safety
master; Your lordship; My lord; husband
terminal; computer terminal; information access device (smartphone, tablet, book-reader, etc.); end (e.g. of a roll of film)
to start (something); to start up; to boot (a computer); to launch (a business)
that is to say; so that means
vacuum cleaner; vacuum; hoover