bergamot vs orange tree

bergamot and orange tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
bergamot	Yes	No	No	No
orange tree	Yes	No	No	No

As nouns, orange tree is a hypernym of bergamot; that is, orange tree is a word with a broader meaning than bergamot:

bergamot: small tree with pear-shaped fruit whose oil is used in perfumery; Italy
orange tree: any citrus tree bearing oranges

Other hypernyms of bergamot include orange.

bergamot (noun)	orange tree (noun)
small tree with pear-shaped fruit whose oil is used in perfumery; Italy	any citrus tree bearing oranges