flake vs fragment

flake and fragment both are nouns.

Word	Noun	Adjective	Verb	Adverb
flake	Yes	No	Yes	No
fragment	Yes	No	Yes	No

As nouns, fragment is a hypernym of flake; that is, fragment is a word with a broader meaning than flake:

flake (noun)	fragment (noun)
a small fragment of something broken off from the whole	a broken piece of a brittle artifact
a person with an unusual or odd personality	an incomplete piece
a crystal of snow	a piece broken off or cut off of something else

flake (verb)	fragment (verb)
come off in flakes or thin small pieces	break or cause to break into pieces
cover with flakes or as if with flakes
form into flakes