bread board vs breadboard

bread board and breadboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
bread board	Yes	No	No	No
breadboard	Yes	No	No	No

As nouns, bread board and breadboard are synonyms defined as:

bread board and breadboard: a wooden or plastic board on which dough is kneaded or bread is sliced

bread board (noun)	breadboard (noun)
a wooden or plastic board on which dough is kneaded or bread is sliced	a wooden or plastic board on which dough is kneaded or bread is sliced