halt vs unfit

halt is a noun but unfit is not a noun.

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

halt (noun)	unfit (noun)
an interruption or temporary suspension of progress or movement
the event of something ending
the state of inactivity following an interruption

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

halt (verb)	unfit (verb)
stop the flow of a liquid	make unfit or unsuitable
come to a halt, stop moving
cause to come to an abrupt stop
stop from happening or developing