unfit vs alter

unfit is an adjective but alter is not an adjective.

Word	Noun	Adjective	Verb	Adverb
unfit	No	Yes	Yes	No
alter	No	No	Yes	No

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

Other hypernyms of unfit include change, modify.

unfit (adjective)	alter (adjective)
not in good physical or mental condition; out of condition
below the required standards for a purpose
physically unsound or diseased

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