Prunus avium vs gean

Prunus avium and gean both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prunus avium	Yes	No	No	No
gean	Yes	No	No	No

As nouns, gean is a hyponym of Prunus avium; that is, gean is a word with a more specific, narrower meaning than Prunus avium:

Prunus avium: large Eurasian tree producing small dark bitter fruit in the wild but edible sweet fruit under cultivation
gean: wild or seedling sweet cherry used as stock for grafting

Other hyponyms of Prunus avium include heart cherry, oxheart, oxheart cherry, mazzard, mazzard cherry.

Prunus avium (noun)	gean (noun)
large Eurasian tree producing small dark bitter fruit in the wild but edible sweet fruit under cultivation	wild or seedling sweet cherry used as stock for grafting