medlar vs medlar tree

medlar and medlar tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
medlar	Yes	No	No	No
medlar tree	Yes	No	No	No

As nouns, medlar and medlar tree are synonyms defined as:

medlar and medlar tree: small deciduous Eurasian tree cultivated for its fruit that resemble crab apples

Other synonyms of medlar include Mespilus germanica.

medlar (noun)	medlar tree (noun)
crabapple-like fruit used for preserves	small deciduous Eurasian tree cultivated for its fruit that resemble crab apples
a South African globular fruit with brown leathery skin and pithy flesh having a sweet-acid taste
small deciduous Eurasian tree cultivated for its fruit that resemble crab apples
small deciduous tree of southern Africa having edible fruit