sorb apple vs Sorbus domestica

sorb apple and Sorbus domestica both are nouns.

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

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

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

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

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