cirrostratus vs cirrostratus cloud

cirrostratus and cirrostratus cloud both are nouns.

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

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

cirrostratus and cirrostratus cloud: a thin uniform layer of hazy cloud at high altitude

cirrostratus (noun)	cirrostratus cloud (noun)
a thin uniform layer of hazy cloud at high altitude	a thin uniform layer of hazy cloud at high altitude