altostratus vs altostratus cloud

altostratus and altostratus cloud both are nouns.

Word	Noun	Adjective	Verb	Adverb
altostratus	Yes	No	No	No
altostratus cloud	Yes	No	No	No

As nouns, altostratus and altostratus cloud are synonyms defined as:

altostratus and altostratus cloud: a stratus cloud at an intermediate altitude of 2 or 3 miles

altostratus (noun)	altostratus cloud (noun)
a stratus cloud at an intermediate altitude of 2 or 3 miles	a stratus cloud at an intermediate altitude of 2 or 3 miles