damson plum vs Prunus insititia

damson plum and Prunus insititia both are nouns.

Word	Noun	Adjective	Verb	Adverb
damson plum	Yes	No	No	No
Prunus insititia	Yes	No	No	No

As nouns, Prunus insititia is a hypernym of damson plum; that is, Prunus insititia is a word with a broader meaning than damson plum:

damson plum: plum tree long cultivated for its edible fruit
Prunus insititia: small wild or half-domesticated Eurasian plum bearing small ovoid fruit in clusters

Other hypernyms of damson plum include bullace.

damson plum (noun)	Prunus insititia (noun)
dark purple plum of the damson tree	small wild or half-domesticated Eurasian plum bearing small ovoid fruit in clusters
plum tree long cultivated for its edible fruit
tropical American timber tree with dark hard heavy wood and small plumlike purple fruit