Malus pumila vs orchard apple tree

Malus pumila and orchard apple tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Malus pumila	Yes	No	No	No
orchard apple tree	Yes	No	No	No

As nouns, Malus pumila and orchard apple tree are synonyms defined as:

Malus pumila and orchard apple tree: native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits

Other synonyms of Malus pumila include apple.

Malus pumila (noun)	orchard apple tree (noun)
native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits	native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits