Tilia heterophylla vs lime tree

Tilia heterophylla and lime tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tilia heterophylla	Yes	No	No	No
lime tree	Yes	No	No	No

As nouns, lime tree is a hypernym of Tilia heterophylla; that is, lime tree is a word with a broader meaning than Tilia heterophylla:

Tilia heterophylla: American basswood of the Allegheny region
lime tree: any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber

Other hypernyms of Tilia heterophylla include basswood, lime, linden, linden tree.

Tilia heterophylla (noun)	lime tree (noun)
American basswood of the Allegheny region	any of various related trees bearing limes
	any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber