antiproton vs nucleon

antiproton and nucleon both are nouns.

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

As nouns, nucleon is a hypernym of antiproton; that is, nucleon is a word with a broader meaning than antiproton:

antiproton: an unstable negatively charged proton; the antiparticle of a proton
nucleon: a constituent (proton or neutron) of an atomic nucleus

antiproton (noun)	nucleon (noun)
an unstable negatively charged proton; the antiparticle of a proton	a constituent (proton or neutron) of an atomic nucleus