Pyrus communis vs pear tree

Pyrus communis and pear tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pyrus communis	Yes	No	No	No
pear tree	Yes	No	No	No

As nouns, Pyrus communis and pear tree are synonyms defined as:

Pyrus communis and pear tree: Old World tree having sweet gritty-textured juicy fruit; widely cultivated in many varieties

Other synonyms of Pyrus communis include pear.

Pyrus communis (noun)	pear tree (noun)
Old World tree having sweet gritty-textured juicy fruit; widely cultivated in many varieties	Old World tree having sweet gritty-textured juicy fruit; widely cultivated in many varieties