hire vs fill

hire and fill both are nouns.

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

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

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

hire (noun)	fill (noun)
the act of hiring something or someone	a quantity sufficient to satisfy
a newly hired employee	any material that fills a space or container

hire (verb)	fill (verb)
engage for service under a term of contract	become full
engage or hire for work	make full, also in a metaphorical sense
hold under a lease or rental agreement; of goods and services	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