subgenus Azaleastrum vs subgenus Azalea

subgenus Azaleastrum and subgenus Azalea both are nouns.

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

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

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

Other synonyms of subgenus Azaleastrum include Azaleastrum.

subgenus Azaleastrum (noun)	subgenus Azalea (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