bend sinister vs bar sinister

bend sinister and bar sinister both are nouns.

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

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

bend sinister and bar sinister: a mark of bastardy; lines from top right to bottom left

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