exert vs employ

exert is not a noun while employ is a noun.

Word	Noun	Adjective	Verb	Adverb
exert	No	No	Yes	No
employ	Yes	No	Yes	No

As verbs, employ is a hypernym of exert; that is, employ is a word with a broader meaning than exert:

exert: put to use
employ: put into service; make work or employ for a particular purpose or for its inherent or natural purpose

Other hypernyms of exert include apply, use, utilise, utilize.

exert (noun)	employ (noun)
	the state of being employed or having a job

exert (verb)	employ (verb)
put to use	put into service; make work or employ for a particular purpose or for its inherent or natural purpose
have and exercise	engage or hire for work
make a great effort at a mental or physical task