hadron vs antimeson

hadron and antimeson both are nouns.

Word	Noun	Adjective	Verb	Adverb
hadron	Yes	No	No	No
antimeson	Yes	No	No	No

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

hadron: any elementary particle that interacts strongly with other particles
antimeson: the antiparticle of a meson

Other hyponyms of hadron include antibaryon, baryon, heavy particle, meson, mesotron.

hadron (noun)	antimeson (noun)
any elementary particle that interacts strongly with other particles	the antiparticle of a meson