plugboard vs patchboard

plugboard and patchboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
plugboard	Yes	No	No	No
patchboard	Yes	No	No	No

As nouns, plugboard and patchboard are synonyms defined as:

plugboard and patchboard: telephone central where circuits are completed with patchcords

Other synonyms of plugboard include switchboard.

plugboard (noun)	patchboard (noun)
telephone central where circuits are completed with patchcords	telephone central where circuits are completed with patchcords