lighten up vs change

lighten up is not a noun while change is a noun.

Word	Noun	Adjective	Verb	Adverb
lighten up	No	No	Yes	No
change	Yes	No	Yes	No

As verbs, change is a hypernym of lighten up; that is, change is a word with a broader meaning than lighten up:

Other hypernyms of lighten up include alter, modify.

As verbs, change is a hypernym of lighten up; that is, change is a word with a broader meaning than lighten up:

lighten up: become lighter
change: undergo a change; become different in essence; losing one's or its original nature

lighten up (noun)	change (noun)
	the action of changing something
	a different or fresh set of clothes
	a thing that is different
	a difference that is usually pleasant
	an event that occurs when something passes from one state or phase to another
	the result of alteration or modification
	coins of small denomination regarded collectively
	the balance of money received when the amount you tender is greater than the amount due
	money received in return for its equivalent in a larger denomination or a different currency
	a relational difference between states; especially between states before and after some event

lighten up (verb)	change (verb)
make more cheerful through the use of color	undergo a change; become different in essence; losing one's or its original nature
become lighter	cause to change; make different; cause a transformation
become more cheerful	become different in some particular way, without permanently losing one's or its former characteristics or essence
make more cheerful	change clothes; put on different clothes
	exchange or replace with another, usually of the same kind or category
	lay aside, abandon, or leave for another
	remove or replace the coverings of
	become deeper in tone
	change from one vehicle or transportation line to another
	give to, and receive from, one another