stigma vs bar sinister

stigma and bar sinister both are nouns.

Word	Noun	Adjective	Verb	Adverb
stigma	Yes	No	No	No
bar sinister	Yes	No	No	No

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

Other hyponyms of stigma include demerit, bend sinister, cloven foot, cloven hoof.

stigma (noun)	bar sinister (noun)
a skin lesion that is a diagnostic sign of some disease	a mark of bastardy; lines from top right to bottom left
an external tracheal aperture in a terrestrial arthropod	the status of being born to parents who were not married
a symbol of disgrace or infamy
the apical end of the style where deposited pollen enters the pistil