Malus pumila vs apple

Malus pumila and apple both are nouns.

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

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

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

Other synonyms of Malus pumila include orchard apple tree.

Malus pumila (noun)	apple (noun)
native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits	fruit with red or yellow or green skin and sweet to tart crisp whitish flesh
	native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits