blain vs chilblains

blain and chilblains both are nouns.

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

As nouns, chilblains is a hyponym of blain; that is, chilblains is a word with a more specific, narrower meaning than blain:

blain: an inflammatory swelling or sore
chilblains: inflammation of the hands and feet caused by exposure to cold and moisture

Other hyponyms of blain include chilblain, pernio.

blain (noun)	chilblains (noun)
an inflammatory swelling or sore	inflammation of the hands and feet caused by exposure to cold and moisture