nucleon vs neutron

nucleon and neutron both are nouns.

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

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

nucleon: a constituent (proton or neutron) of an atomic nucleus
neutron: an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus

Other hyponyms of nucleon include antineutron, antiproton, proton.

nucleon (noun)	neutron (noun)
a constituent (proton or neutron) of an atomic nucleus	an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus