forefinger vs index finger

forefinger and index finger both are nouns.

Word	Noun	Adjective	Verb	Adverb
forefinger	Yes	No	No	No
index finger	Yes	No	No	No

As nouns, forefinger and index finger are synonyms defined as:

Other synonyms of forefinger include index.

forefinger (noun)	index finger (noun)
the finger next to the thumb	the finger next to the thumb