musca volitans vs spots

musca volitans and spots both are nouns.

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

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

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

Other synonyms of musca volitans include floater, muscae volitantes.

musca volitans (noun)	spots (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