aftersensation vs afterimage

aftersensation and afterimage both are nouns.

Word	Noun	Adjective	Verb	Adverb
aftersensation	Yes	No	No	No
afterimage	Yes	No	No	No

As nouns, aftersensation and afterimage are synonyms defined as:

aftersensation and afterimage: an image (usually a negative image) that persists after stimulation has ceased

aftersensation (noun)	afterimage (noun)
an image (usually a negative image) that persists after stimulation has ceased	an image (usually a negative image) that persists after stimulation has ceased