meson vs hadron

meson and hadron both are nouns.

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

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

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

Other hypernyms of meson include boson.

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