take-up vs tightening

take-up and tightening both are nouns.

Word	Noun	Adjective	Verb	Adverb
take-up	Yes	No	No	No
tightening	Yes	No	No	No

As nouns, tightening is a hypernym of take-up; that is, tightening is a word with a broader meaning than take-up:

take-up: the action of taking up as by tightening or absorption or reeling in
tightening: the act of making something tighter

take-up (noun)	tightening (noun)
the action of taking up as by tightening or absorption or reeling in	the act of making something tighter
any of various devices for reducing slack (as in a sewing machine) or taking up motion (as in a loom)