cool down vs alter

cool down and alter both are verbs.

Word	Noun	Adjective	Verb	Adverb
cool down	No	No	Yes	No
alter	No	No	Yes	No

As verbs, alter is a hypernym of cool down; that is, alter is a word with a broader meaning than cool down:

Other hypernyms of cool down include change, modify.

cool down (verb)	alter (verb)
make cool or cooler	remove the ovaries of
loose heat	become different in some particular way, without permanently losing one's or its former characteristics or essence
lose intensity	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to