halt vs prevent

halt is a noun but prevent is not a noun.

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

As verbs, prevent is a hypernym of halt; that is, prevent is a word with a broader meaning than halt:

Other hypernyms of halt include forbid, foreclose, forestall, preclude.

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

halt (adjective)	prevent (adjective)
disabled in the feet or legs

halt (verb)	prevent (verb)
stop the flow of a liquid	stop (someone or something) from doing something or being in a certain state
come to a halt, stop moving	keep from happening or arising; make impossible
cause to come to an abrupt stop
stop from happening or developing