saskatoon vs service tree

saskatoon and service tree both are nouns.

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

saskatoon (noun)	service tree (noun)
edible purple or red berries	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