spots vs musca volitans

spots and musca volitans both are nouns.

Word	Noun	Adjective	Verb	Adverb
spots	Yes	No	No	No
musca volitans	Yes	No	No	No

As nouns, spots and musca volitans are synonyms defined as:

spots and musca volitans: spots before the eyes caused by opaque cell fragments in the vitreous humor and lens

Other synonyms of spots include floater, muscae volitantes.

spots (noun)	musca volitans (noun)
spots before the eyes caused by opaque cell fragments in the vitreous humor and lens	spots before the eyes caused by opaque cell fragments in the vitreous humor and lens