do vs fulfill

do is a noun but fulfill is not a noun.

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

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

Other hypernyms of do include accomplish, action, carry out, carry through, execute, fulfil.

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

Other hypernyms of do include fulfil, live up to, satisfy.

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

do (verb)	fulfill (verb)
arrange attractively	fill, satisfy or meet a want or need or condition or restriction
behave in a certain manner; show a certain behavior; conduct or comport oneself	put in effect
create or design, often in a certain way	meet the requirements or expectations of
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