photoelectron vs electron

photoelectron and electron both are nouns.

Word	Noun	Adjective	Verb	Adverb
photoelectron	Yes	No	No	No
electron	Yes	No	No	No

As nouns, electron is a hypernym of photoelectron; that is, electron is a word with a broader meaning than photoelectron:

photoelectron: an electron that is emitted from an atom or molecule by an incident photon
electron: an elementary particle with negative charge

Other hypernyms of photoelectron include negatron.

photoelectron (noun)	electron (noun)
an electron that is emitted from an atom or molecule by an incident photon	an elementary particle with negative charge