burnside vs sideburn

burnside and sideburn both are nouns.

Word	Noun	Adjective	Verb	Adverb
burnside	Yes	No	No	No
sideburn	Yes	No	No	No

As nouns, burnside and sideburn are synonyms defined as:

burnside and sideburn: facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off)

Other synonyms of burnside include mutton chop, side-whiskers.

burnside (noun)	sideburn (noun)
facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off)	facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off)