nimbus vs nimbus cloud

nimbus and nimbus cloud both are nouns.

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

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

Other synonyms of nimbus include rain cloud.

nimbus (noun)	nimbus cloud (noun)
an indication of radiant light drawn around the head of a saint	a dark grey cloud bearing rain
a dark grey cloud bearing rain