K particle vs meson

K particle and meson both are nouns.

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

As nouns, meson is a hypernym of K particle; that is, meson is a word with a broader meaning than K particle:

K particle: an unstable meson produced as the result of a high-energy particle collision
meson: an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0

Other hypernyms of K particle include mesotron.

K particle (noun)	meson (noun)
an unstable meson produced as the result of a high-energy particle collision	an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0