eyespot vs ocellus

eyespot and ocellus both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyespot	Yes	No	No	No
ocellus	Yes	No	No	No

As nouns, eyespot and ocellus are synonyms defined as:

eyespot and ocellus: an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color

eyespot (noun)	ocellus (noun)
an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color	an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color
	an eye having a single lens