employ vs fill

employ and fill both are nouns.

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

As verbs, fill is a hyponym of employ; that is, fill is a word with a more specific, narrower meaning than employ:

Other hyponyms of employ include featherbed, engage, ship, contract, sign, sign on, sign up, rat, farm out, job, subcontract.

employ (noun)	fill (noun)
the state of being employed or having a job	a quantity sufficient to satisfy
	any material that fills a space or container

employ (verb)	fill (verb)
put into service; make work or employ for a particular purpose or for its inherent or natural purpose	become full
engage or hire for work	make full, also in a metaphorical sense
	plug with a substance
	fill to satisfaction
	eat until one is sated
	fill, satisfy or meet a want or need or condition or restriction
	assume, as of positions or roles
	appoint someone to (a position or a job)
	occupy the whole of