mu-meson vs negative muon

mu-meson and negative muon both are nouns.

Word	Noun	Adjective	Verb	Adverb
mu-meson	Yes	No	No	No
negative muon	Yes	No	No	No

As nouns, mu-meson and negative muon are synonyms defined as:

mu-meson and negative muon: an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino

Other synonyms of mu-meson include muon.

mu-meson (noun)	negative muon (noun)
an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino	an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino