heat up vs alter

heat up and alter both are verbs.

Word	Noun	Adjective	Verb	Adverb
heat up	No	No	Yes	No
alter	No	No	Yes	No

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

Other hypernyms of heat up include change, modify.

heat up (verb)	alter (verb)
make hot or hotter	remove the ovaries of
gain heat or get hot	become different in some particular way, without permanently losing one's or its former characteristics or essence
make more intense	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to