breadboard vs bread board

breadboard and bread board both are nouns.

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

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

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

breadboard (noun)	bread board (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