bastardy vs bar sinister

bastardy and bar sinister both are nouns.

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

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

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

Other synonyms of bastardy include illegitimacy.

bastardy (noun)	bar sinister (noun)
the status of being born to parents who were not married	a mark of bastardy; lines from top right to bottom left
	the status of being born to parents who were not married