different between bulkier vs bulker

English

bulkier

From bulk +? -er.

bulker (plural bulkers)

(nautical) A bulk dry goods cargo ship.
- 2010, Duncan Falconer, Pirate
  The bulker began to swerve from side to side, as sharply as it could, creating large waves behind it, sending a churning wake towards the pirate boats.
(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.
A person who bulks (gains body mass).
Anything, such as a dietary supplement or an exercise, that helps a person to gain body mass.

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