pinpoint vs fleck

pinpoint and fleck both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinpoint	Yes	No	Yes	No
fleck	Yes	No	Yes	No

As nouns, fleck is a hypernym of pinpoint; that is, fleck is a word with a broader meaning than pinpoint:

Other hypernyms of pinpoint include dapple, maculation, patch, speckle, spot.

pinpoint (noun)	fleck (noun)
the sharp point of a pin	a small contrasting part of something
a very small spot	a small fragment of something broken off from the whole
a very brief moment

pinpoint (verb)	fleck (verb)
locate exactly	make a spot or mark onto