tighten vs compact

tighten is not a noun while compact is a noun.

Word	Noun	Adjective	Verb	Adverb
tighten	No	No	Yes	No
compact	Yes	Yes	Yes	No

As verbs, compact is a hyponym of tighten; that is, compact is a word with a more specific, narrower meaning than tighten:

Other hyponyms of tighten include constrict, constringe, narrow, firm, tauten, compress, constrict, contract, press, squeeze, strain, tense.

tighten (noun)	compact (noun)
	a small cosmetics case with a mirror; to be carried in a woman's purse
	a small and economical car
	a signed written agreement between two or more parties (nations) to perform some action

tighten (adjective)	compact (adjective)
	closely and firmly united or packed together
	briefly giving the gist of something
	having a short and solid form or stature

tighten (verb)	compact (verb)
become tight or tighter	squeeze or press together
make tight or tighter	compress into a wad
severely restrict in scope or extent	make more compact by or as if by pressing
narrow or limit	have the property of being packable or of compacting easily