evasion vs cavil

evasion and cavil both are nouns.

Word	Noun	Adjective	Verb	Adverb
evasion	Yes	No	No	No
cavil	Yes	No	Yes	No

As nouns, cavil is a hyponym of evasion; that is, cavil is a word with a more specific, narrower meaning than evasion:

evasion: a statement that is not literally false but that cleverly avoids an unpleasant truth
cavil: an evasion of the point of an argument by raising irrelevant distinctions or objections

Other hyponyms of evasion include circumlocution, indirect expression, doublespeak, hedge, hedging, quibble, quiddity.

evasion (noun)	cavil (noun)
the act of physically escaping from something (an opponent or a pursuer or an unpleasant situation) by some adroit maneuver	an evasion of the point of an argument by raising irrelevant distinctions or objections
nonperformance of something distasteful (as by deceit or trickery) that you are supposed to do
the deliberate act of failing to pay money
a statement that is not literally false but that cleverly avoids an unpleasant truth

evasion (verb)	cavil (verb)
	raise trivial objections