RhymeZone: bulker definitions

Definitions of bulker:

noun: (nautical) A bulk dry goods cargo ship.
noun: (nautical) A person employed to ascertain the bulk or size of goods, in order to fix the amount of freight or dues payable on them.
noun: A person who bulks (gains body mass).
noun: Anything, such as a dietary supplement or an exercise, that helps a person to gain body mass.

(Definitions from Wiktionary)