tighten vs modify

tighten and modify both are verbs.

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

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

Other hypernyms of tighten include alter, change.

tighten (verb)	modify (verb)
become tight or tighter	make less severe or harsh or extreme
make tight or tighter	add a modifier to a constituent
severely restrict in scope or extent	cause to change; make different; cause a transformation
narrow or limit