manual alphabet vs finger alphabet

manual alphabet and finger alphabet both are nouns.

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

As nouns, manual alphabet and finger alphabet are synonyms defined as:

manual alphabet and finger alphabet: an alphabet used by the deaf; letters are represented by finger positions

manual alphabet (noun)	finger alphabet (noun)
an alphabet used by the deaf; letters are represented by finger positions	an alphabet used by the deaf; letters are represented by finger positions