mar vs stigma

mar and stigma both are nouns.

Word	Noun	Adjective	Verb	Adverb
mar	Yes	No	Yes	No
stigma	Yes	No	No	No

As nouns, stigma is a hyponym of mar; that is, stigma is a word with a more specific, narrower meaning than mar:

mar: a mark or flaw that spoils the appearance of something (especially on a person's body)
stigma: a skin lesion that is a diagnostic sign of some disease

mar (noun)	stigma (noun)
a mark or flaw that spoils the appearance of something (especially on a person's body)	a skin lesion that is a diagnostic sign of some disease
	an external tracheal aperture in a terrestrial arthropod
	a symbol of disgrace or infamy
	the apical end of the style where deposited pollen enters the pistil

mar (verb)	stigma (verb)
destroy or injure severely
make imperfect