serve vs suffice

serve is a noun but suffice is not a noun.

Word	Noun	Adjective	Verb	Adverb
serve	Yes	No	Yes	No
suffice	No	No	Yes	No

As verbs, suffice is a hypernym of serve; that is, suffice is a word with a broader meaning than serve:

Other hypernyms of serve include answer, do, serve.

As verbs, serve and suffice are synonyms defined as:

serve and suffice: be sufficient; be adequate, either in quality or quantity

Other synonyms of serve include answer, do.

serve (noun)	suffice (noun)
(sports) a stroke that puts the ball in play

serve (verb)	suffice (verb)
do duty or hold offices; serve in a specific function	be sufficient; be adequate, either in quality or quantity
put the ball into play
provide (usually but not necessarily food)
help to some food; help with food or drink
deliver a warrant or summons to someone
mate with
be used by; as of a utility
work for, or be a servant to
devote (part of) one's life or efforts to, as of countries, institutions, or ideas
do military service
spend time in prison or in a labor camp
contribute or conduce to
promote, benefit, or be useful or beneficial to
serve a purpose, role, or function
be sufficient; be adequate, either in quality or quantity