meson vs J particle

meson and J particle both are nouns.

Word	Noun	Adjective	Verb	Adverb
meson	Yes	No	No	No
J particle	Yes	No	No	No

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

meson: an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
J particle: a neutral meson with a large mass

Other hyponyms of meson include b-meson, psi particle, k-meson, K particle, kaon, kappa-meson, pi-meson, pion.

meson (noun)	J particle (noun)
an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0	a neutral meson with a large mass