fulfill vs do

fulfill is not a noun while do is a noun.

Word	Noun	Adjective	Verb	Adverb
fulfill	No	No	Yes	No
do	Yes	No	Yes	No

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

Other hyponyms of fulfill include get over, run, consummate, consummate, perform, complete, discharge, dispatch.

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

Other hyponyms of fulfill include answer, serve, suffice, cover.

fulfill (noun)	do (noun)
	an uproarious party
	the syllable naming the first (tonic) note of any major scale in solmization

fulfill (verb)	do (verb)
fill, satisfy or meet a want or need or condition or restriction	arrange attractively
put in effect	behave in a certain manner; show a certain behavior; conduct or comport oneself
meet the requirements or expectations of	create or design, often in a certain way
	carry out or perform an action
	give rise to; cause to happen or occur, not always intentionally
	travel or traverse (a distance)
	engage in
	carry out or practice; as of jobs and professions
	carry on or function
	get (something) done
	proceed or get along
	be sufficient; be adequate, either in quality or quantity
	spend time in prison or in a labor camp