gangboard vs gangway

gangboard and gangway both are nouns.

Word	Noun	Adjective	Verb	Adverb
gangboard	Yes	No	No	No
gangway	Yes	No	No	No

As nouns, gangboard and gangway are synonyms defined as:

gangboard and gangway: a temporary bridge for getting on and off a vessel at dockside

Other synonyms of gangboard include gangplank.

gangboard (noun)	gangway (noun)
a temporary bridge for getting on and off a vessel at dockside	a temporary passageway of planks (as over mud on a building site)
	a temporary bridge for getting on and off a vessel at dockside
	passageway between seating areas as in an auditorium or passenger vehicle or between areas of shelves of goods as in stores