fracture vs crack

fracture and crack both are nouns.

Word	Noun	Adjective	Verb	Adverb
fracture	Yes	No	Yes	No
crack	Yes	Yes	Yes	No

As nouns, fracture and crack are synonyms defined as:

Other synonyms of fracture include cracking.

As nouns, crack is a hypernym of fracture; that is, crack is a word with a broader meaning than fracture:

fracture: (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
crack: a long narrow cleft

Other hypernyms of fracture include cleft, crevice, fissure, scissure.

fracture (noun)	crack (noun)
the act of cracking something	the act of cracking something
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other	a usually brief attempt
breaking of hard tissue such as bone	a narrow opening
	a purified and potent form of cocaine that is smoked rather than snorted; highly addictive
	a blemish resulting from a break without complete separation of the parts
	witty remark
	a sudden sharp noise
	a long narrow cleft
	a long narrow depression in a surface
	a chance to do something

fracture (adjective)	crack (adjective)
	of the highest quality

fracture (verb)	crack (verb)
fracture a bone of	break suddenly and abruptly, as under tension
become fractured	become fractured; break or crack on the surface only
violate or abuse	break partially but keep its integrity
break into pieces	cause to become cracked
interrupt, break, or destroy	reduce (petroleum) to a simpler compound by cracking
	break into simpler molecules by means of heat
	pass through (a barrier)
	tell spontaneously
	hit forcefully; deal a hard blow, making a cracking noise
	suffer a nervous breakdown
	make a sharp sound
	make a very sharp explosive sound
	gain unauthorized access computers with malicious intentions