kaon vs kappa-meson

kaon and kappa-meson both are nouns.

Word	Noun	Adjective	Verb	Adverb
kaon	Yes	No	No	No
kappa-meson	Yes	No	No	No

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

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

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

kaon (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