nucleon vs proton

nucleon and proton both are nouns.

Word	Noun	Adjective	Verb	Adverb
nucleon	Yes	No	No	No
proton	Yes	No	No	No

As nouns, proton is a hyponym of nucleon; that is, proton is a word with a more specific, narrower meaning than nucleon:

nucleon: a constituent (proton or neutron) of an atomic nucleus
proton: a stable particle with positive charge equal to the negative charge of an electron

Other hyponyms of nucleon include antineutron, antiproton, neutron.

nucleon (noun)	proton (noun)
a constituent (proton or neutron) of an atomic nucleus	a stable particle with positive charge equal to the negative charge of an electron