cirrus vs cirrus cloud

cirrus and cirrus cloud both are nouns.

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

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

cirrus and cirrus cloud: a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)

cirrus (noun)	cirrus cloud (noun)
a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile	a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
usually coiled