hadron vs meson

hadron and meson both are nouns.

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

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

hadron: any elementary particle that interacts strongly with other particles
meson: an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0

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

hadron (noun)	meson (noun)
any elementary particle that interacts strongly with other particles	an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0