truncate vs approximate

truncate and approximate both are adjectives.

Word	Noun	Adjective	Verb	Adverb
truncate	No	Yes	Yes	No
approximate	No	Yes	Yes	No

As verbs, approximate is a hypernym of truncate; that is, approximate is a word with a broader meaning than truncate:

Other hypernyms of truncate include estimate, gauge, guess, judge.

truncate (adjective)	approximate (adjective)
terminating abruptly by having or as if having an end or point cut off	located close together
	very close in resemblance
	not quite exact or correct

truncate (verb)	approximate (verb)
make shorter as if by cutting off	judge tentatively or form an estimate of (quantities or time)
approximate by ignoring all terms beyond a chosen one	be close or similar
replace a corner by a plane