sorb vs service tree

sorb and service tree both are nouns.

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

sorb (noun)	service tree (noun)
acid gritty-textured fruit	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

sorb (verb)	service tree (verb)
take up a liquid or a gas either by adsorption or by absorption