blain vs chilblain

blain and chilblain both are nouns.

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

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

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

Other hyponyms of blain include chilblains, pernio.

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