pinky vs little finger

pinky and little finger both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinky	Yes	No	No	No
little finger	Yes	No	No	No

As nouns, pinky and little finger are synonyms defined as:

Other synonyms of pinky include pinkie.

pinky (noun)	little finger (noun)
the finger farthest from the thumb	the finger farthest from the thumb