chilblains vs chilblain

chilblains and chilblain both are nouns.

Word	Noun	Adjective	Verb	Adverb
chilblains	Yes	No	No	No
chilblain	Yes	No	No	No

As nouns, chilblains and chilblain are synonyms defined as:

chilblains and chilblain: inflammation of the hands and feet caused by exposure to cold and moisture

Other synonyms of chilblains include pernio.

chilblains (noun)	chilblain (noun)
inflammation of the hands and feet caused by exposure to cold and moisture	inflammation of the hands and feet caused by exposure to cold and moisture