lepton vs fundamental particle

lepton and fundamental particle both are nouns.

Word	Noun	Adjective	Verb	Adverb
lepton	Yes	No	No	No
fundamental particle	Yes	No	No	No

As nouns, fundamental particle is a hypernym of lepton; that is, fundamental particle is a word with a broader meaning than lepton:

lepton: an elementary particle that participates in weak interactions; has a baryon number of 0
fundamental particle: (physics) a particle that is less complex than an atom; regarded as constituents of all matter

Other hypernyms of lepton include elementary particle, fermion.

lepton (noun)	fundamental particle (noun)
an elementary particle that participates in weak interactions; has a baryon number of 0	(physics) a particle that is less complex than an atom; regarded as constituents of all matter
100 lepta equal 1 drachma in Greece