Sorbus domestica vs sorb apple tree

Sorbus domestica and sorb apple tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sorbus domestica	Yes	No	No	No
sorb apple tree	Yes	No	No	No

As nouns, Sorbus domestica and sorb apple tree are synonyms defined as:

Sorbus domestica and sorb apple tree: medium-sized European tree resembling the rowan but bearing edible fruit

Other synonyms of Sorbus domestica include service tree, sorb apple.

Sorbus domestica (noun)	sorb apple tree (noun)
medium-sized European tree resembling the rowan but bearing edible fruit	medium-sized European tree resembling the rowan but bearing edible fruit