unfit vs disqualify

unfit is an adjective but disqualify is not an adjective.

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

As verbs, unfit and disqualify are synonyms defined as:

Other synonyms of unfit include indispose.

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

unfit (verb)	disqualify (verb)
make unfit or unsuitable	make unfit or unsuitable
	declare unfit