finger alphabet vs alphabet

finger alphabet and alphabet both are nouns.

Word	Noun	Adjective	Verb	Adverb
finger alphabet	Yes	No	No	No
alphabet	Yes	No	No	No

As nouns, alphabet is a hypernym of finger alphabet; that is, alphabet is a word with a broader meaning than finger alphabet:

finger alphabet: an alphabet used by the deaf; letters are represented by finger positions
alphabet: a character set that includes letters and is used to write a language

Other hypernyms of finger alphabet include ABC's, ABC, ABCs.

finger alphabet (noun)	alphabet (noun)
an alphabet used by the deaf; letters are represented by finger positions	the elementary stages of any subject (usually plural)
	a character set that includes letters and is used to write a language