truncate vs replace

truncate is an adjective but replace is not an adjective.

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

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

Other hypernyms of truncate include exchange, interchange, substitute.

truncate (adjective)	replace (adjective)
terminating abruptly by having or as if having an end or point cut off

truncate (verb)	replace (verb)
make shorter as if by cutting off	substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected)
approximate by ignoring all terms beyond a chosen one	put something back where it belongs
replace a corner by a plane	put in the place of another; switch seemingly equivalent items
	take the place or move into the position of