tighten vs firm

tighten is not a noun while firm is a noun.

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

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

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

Other hyponyms of tighten include frap, tauten, screw, wind, wind up.

tighten (noun)	firm (noun)
	the members of a business organization that owns or operates one or more establishments

tighten (adjective)	firm (adjective)
	unwavering in devotion to friend or vow or cause
	securely fixed in place
	strong and sure
	not soft or yielding to pressure
	possessing the tone and resiliency of healthy tissue
	marked by firm determination or resolution; not shakable
	securely established
	not subject to revision or change
	(of especially a person's physical features) not shaking or trembling
	not liable to fluctuate or especially to fall

tighten (verb)	firm (verb)
become tight or tighter	become taut or tauter
make tight or tighter	make taut or tauter
severely restrict in scope or extent
narrow or limit

tighten (adverb)	firm (adverb)
	with resolute determination