tighten vs limit

tighten is not a noun while limit is a noun.

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

As verbs, limit is a hypernym of tighten; that is, limit is a word with a broader meaning than tighten:

Other hypernyms of tighten include bound, confine, restrict, throttle, trammel.

As verbs, limit is a hypernym of tighten; that is, limit is a word with a broader meaning than tighten:

Other hypernyms of tighten include bound, confine, restrict, throttle, trammel.

tighten (noun)	limit (noun)
	the greatest possible degree of something
	the boundary of a specific area
	as far as something can go
	the greatest amount of something that is possible or allowed
	the mathematical value toward which a function goes as the independent variable approaches infinity
	final or latest limiting point

tighten (verb)	limit (verb)
become tight or tighter	restrict or confine within limits
make tight or tighter	place limits on (extent or amount or access)
severely restrict in scope or extent	decide upon or fix definitely
narrow or limit