bister vs bistre

bister and bistre both are nouns.

Word	Noun	Adjective	Verb	Adverb
bister	Yes	No	No	No
bistre	Yes	No	No	No

As nouns, bister and bistre are synonyms defined as:

bister and bistre: a water-soluble brownish-yellow pigment made by boiling wood soot

bister (noun)	bistre (noun)
a water-soluble brownish-yellow pigment made by boiling wood soot	a water-soluble brownish-yellow pigment made by boiling wood soot