brewer's grain vs draff

brewer's grain and draff both are nouns.

Word	Noun	Adjective	Verb	Adverb
brewer's grain	Yes	No	No	No
draff	Yes	No	No	No

As nouns, brewer's grain and draff are synonyms defined as:

brewer's grain and draff: the residue of malt and grain which remains in the mash-kettle after the mashing and lautering process.

Other synonyms of brewer's grain include spent grain.

brewer's grain (noun)	draff (noun)
the residue of malt and grain which remains in the mash-kettle after the mashing and lautering process.	the residue of malt and grain which remains in the mash-kettle after the mashing and lautering process.