subgenus Azalea vs Azaleastrum

subgenus Azalea and Azaleastrum both are nouns.

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

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

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

Other synonyms of subgenus Azalea include subgenus Azaleastrum.

subgenus Azalea (noun)	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