positive muon vs antimuon

positive muon and antimuon both are nouns.

Word	Noun	Adjective	Verb	Adverb
positive muon	Yes	No	No	No
antimuon	Yes	No	No	No

As nouns, positive muon and antimuon are synonyms defined as:

positive muon and antimuon: the antiparticle of a muon; decays to positron and neutrino and antineutrino

positive muon (noun)	antimuon (noun)
the antiparticle of a muon; decays to positron and neutrino and antineutrino	the antiparticle of a muon; decays to positron and neutrino and antineutrino