bar sinister vs illegitimacy

bar sinister and illegitimacy both are nouns.

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

As nouns, bar sinister and illegitimacy are synonyms defined as:

bar sinister and illegitimacy: the status of being born to parents who were not married

Other synonyms of bar sinister include bastardy.

bar sinister (noun)	illegitimacy (noun)
a mark of bastardy; lines from top right to bottom left	unlawfulness by virtue of not being authorized by or in accordance with law
the status of being born to parents who were not married	the status of being born to parents who were not married