garboard plank vs garboard

garboard plank and garboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
garboard plank	Yes	No	No	No
garboard	Yes	No	No	No

As nouns, garboard plank and garboard are synonyms defined as:

garboard plank and garboard: the first wale laid next to the keel of a wooden ship

Other synonyms of garboard plank include garboard strake.

garboard plank (noun)	garboard (noun)
the first wale laid next to the keel of a wooden ship	the first wale laid next to the keel of a wooden ship