antilepton vs positron

antilepton and positron both are nouns.

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

As nouns, positron is a hyponym of antilepton; that is, positron is a word with a more specific, narrower meaning than antilepton:

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

Other hyponyms of antilepton include antimuon, positive muon, antineutrino, antitauon, tau-plus particle, antielectron.

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