lepton vs negative muon

lepton and negative muon both are nouns.

Word	Noun	Adjective	Verb	Adverb
lepton	Yes	No	No	No
negative muon	Yes	No	No	No

As nouns, negative muon is a hyponym of lepton; that is, negative muon is a word with a more specific, narrower meaning than lepton:

lepton: an elementary particle that participates in weak interactions; has a baryon number of 0
negative muon: an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino

Other hyponyms of lepton include electron, negatron, mu-meson, muon, neutrino, tau-minus particle, tauon.

lepton (noun)	negative muon (noun)
an elementary particle that participates in weak interactions; has a baryon number of 0	an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
100 lepta equal 1 drachma in Greece