K particle vs kappa-meson

K particle and kappa-meson both are nouns.

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

As nouns, K particle and kappa-meson are synonyms defined as:

K particle and kappa-meson: an unstable meson produced as the result of a high-energy particle collision

Other synonyms of K particle include k-meson, kaon.

K particle (noun)	kappa-meson (noun)
an unstable meson produced as the result of a high-energy particle collision	an unstable meson produced as the result of a high-energy particle collision