As nouns the difference between bulder and bulker
is that bulder is bouldering while bulker is (nautical) a bulk dry goods cargo ship.
bulker
English
Noun
(
en noun)
(nautical) A bulk dry goods cargo ship.
(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.
See also
* tanker
* container ship
* cargo ship
* freighter