Amelanchier vs service tree

Amelanchier and service tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Amelanchier	Yes	No	No	No
service tree	Yes	No	No	No

Amelanchier (noun)	service tree (noun)
North American deciduous trees or shrubs	medium-sized European tree resembling the rowan but bearing edible fruit
	any of various North American trees or shrubs having showy white flowers and edible blue-black or purplish fruit