draff vs brewer's grain

draff and brewer's grain both are nouns.

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

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

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

Other synonyms of draff include spent grain.

draff (noun)	brewer's grain (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.