fill vs allay

fill is a noun but allay is not a noun.

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

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

fill (noun)	allay (noun)
a quantity sufficient to satisfy
any material that fills a space or container

fill (verb)	allay (verb)
become full	satisfy (thirst)
make full, also in a metaphorical sense	lessen the intensity of or calm
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