stigmatism vs astigmatism

stigmatism and astigmatism both are nouns.

Word	Noun	Adjective	Verb	Adverb
stigmatism	Yes	No	No	No
astigmatism	Yes	No	No	No

stigmatism (noun)	astigmatism (noun)
normal eyesight	(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
(optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point	(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
the condition of having or being marked by stigmata