fragment vs sunder

fragment is a noun but sunder is not a noun.

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

As verbs, sunder is a hyponym of fragment; that is, sunder is a word with a more specific, narrower meaning than fragment:

Other hyponyms of fragment include atomise, atomize, bray, comminute, crunch, grind, mash, pound, sliver, splinter, rag, crumb, brecciate, crush, grate, grind.

fragment (noun)	sunder (noun)
a broken piece of a brittle artifact
an incomplete piece
a piece broken off or cut off of something else

fragment (verb)	sunder (verb)
break or cause to break into pieces	break apart or in two, using violence