Azaleastrum vs subgenus Azaleastrum

Azaleastrum and subgenus Azaleastrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Azaleastrum	Yes	No	No	No
subgenus Azaleastrum	Yes	No	No	No

As nouns, Azaleastrum and subgenus Azaleastrum are synonyms defined as:

Azaleastrum and subgenus Azaleastrum: group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron

Other synonyms of Azaleastrum include subgenus Azalea.

Azaleastrum (noun)	subgenus Azaleastrum (noun)
group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron	group of evergreen or deciduous shrubs formerly considered a separate genus; now included in the genus Rhododendron