Words similarity

• viscous - vicious
• restive - restful
• effect - affect
• compass - compress
• indigenous - indigent
• ingenuous (and disingenuous) - ingenious (ingenuity)
• infer - imply
• insensible - insensitive
• elusive - effusive
• corroborate - collaborate
• endemic - epidemic
• dissemble - disassemble
• diffident - different (difference)
• deference - deprecate (deprecation) - depreciate (depreciation)
• fission - division into two or more parts: Nuclear fission is the principle behind nuclear weapons.
  fusion - joining of two or more entities into one, such as in nuclear fusion (the joining of atomic nuclei) or fusion jazz (jazz that joins elements from various musical traditions): They are attempting to harness the energy produced by nuclear fusion
• extant - in existence; used especially to refer to the last surviving examples of something passing out of existence, such as an antique book or a nearly extinct species
  extent - length or amount: The extent of corruption in the bureaucracy was well known.
• incredulous (credulous) - disbelieving, very doubtful incredible (credible) - difficult to believe
• emulate - to pattern one's behavior (on a respected role model) imitate - to copy
• descry - to make open or plain, by saying decry - to condemn
• engender - to bring into being endanger - to put at risk
• ambiguous - vague; capable of various interpretations
  ambivalent - being of two minds; holding conflicting feelings or attitudes
• discomfort (n) - the lack of ease or comfort
• flaunt - to display brazenly or pretentiously
  flout - to show an obvious disregard or disrespect for; to treat contemptuously
• lied - the past tense of lie, as in "He lied about his age to get into the Army."
  lied - (pronounced leed) a song; a type German of song, meant to be sung, as opposed to a purely instrumental tune (since this is actually a German word, the plural is lieder, not lieds)