damson plum vs damson plum

damson plum and damson plum both are nouns.

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

damson plum (noun)	damson plum (noun)
dark purple plum of the damson tree	dark purple plum of the damson tree
plum tree long cultivated for its edible fruit	plum tree long cultivated for its edible fruit
tropical American timber tree with dark hard heavy wood and small plumlike purple fruit	tropical American timber tree with dark hard heavy wood and small plumlike purple fruit