This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One that brays, especially a donkey.

n. Printing A small hand roller used to spread ink thinly and evenly.

n. A hand printing roller used in to spread a thin even layer of ink.

n. One who brays, or makes the sound of a donkey.

n. An implement for braying and spreading ink in hand printing.

n. One that brays like an ass.

n. In printing, a small composition-roller used for triturating and spreading the ink on a table or slab and daubling it on a platen or disk.

n. One who or that which brays like an ass.

"At a minimum look for a water-based fabric ink pad or ink that you can apply to the stamp with a brayer."

pestle   

Breyer    Dreyer    Mayer    Sayer    Speyer    assayer    bayer    conveyer    conveyor    doomsayer