bar sinister vs stigma

bar sinister and stigma both are nouns.

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

As nouns, stigma is a hypernym of bar sinister; that is, stigma is a word with a broader meaning than bar sinister:

Other hypernyms of bar sinister include ordinary, brand, mark, stain.

bar sinister (noun)	stigma (noun)
a mark of bastardy; lines from top right to bottom left	a skin lesion that is a diagnostic sign of some disease
the status of being born to parents who were not married	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