fill vs do work

fill is a noun but do work is not a noun.

Word	Noun	Adjective	Verb	Adverb
fill	Yes	No	Yes	No
do work	No	No	Yes	No

As verbs, do work is a hypernym of fill; that is, do work is a word with a broader meaning than fill:

Other hypernyms of fill include work.

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

fill (verb)	do work (verb)
become full	be employed
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