tighten vs compress

tighten is not a noun while compress is a noun.

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

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

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

tighten (noun)	compress (noun)
	a cloth pad or dressing (with or without medication) applied firmly to some part of the body (to relieve discomfort or reduce fever)

tighten (verb)	compress (verb)
become tight or tighter	squeeze or press together
make tight or tighter	make more compact by or as if by pressing
severely restrict in scope or extent
narrow or limit