positron vs antilepton

positron and antilepton both are nouns.

Word	Noun	Adjective	Verb	Adverb
positron	Yes	No	No	No
antilepton	Yes	No	No	No

As nouns, antilepton is a hypernym of positron; that is, antilepton is a word with a broader meaning than positron:

positron: an elementary particle with positive charge; interaction of a positron and an electron results in annihilation
antilepton: the antiparticle of a lepton

positron (noun)	antilepton (noun)
an elementary particle with positive charge; interaction of a positron and an electron results in annihilation	the antiparticle of a lepton