rubber tree vs genus Hevea

rubber tree and genus Hevea both are nouns.

Word	Noun	Adjective	Verb	Adverb
rubber tree	Yes	No	No	No
genus Hevea	Yes	No	No	No

As nouns, rubber tree and genus Hevea are synonyms defined as:

rubber tree and genus Hevea: small genus of South American trees yielding latex

Other synonyms of rubber tree include Hevea.

rubber tree (noun)	genus Hevea (noun)
small genus of South American trees yielding latex	small genus of South American trees yielding latex