crack vs opening

crack and opening both are nouns.

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

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

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

Other hypernyms of crack include gap.

crack (noun)	opening (noun)
the act of cracking something	a recognized sequence of moves at the beginning of a game of chess
a usually brief attempt	the act of opening something
a narrow opening	becoming open or being made open
a purified and potent form of cocaine that is smoked rather than snorted; highly addictive	the first of a series of actions
a blemish resulting from a break without complete separation of the parts	a vacant or unobstructed space that is man-made
witty remark	an entrance equipped with a hatch; especially a passageway between decks of a ship
a sudden sharp noise	an aperture or hole that opens into a bodily cavity
a long narrow cleft	a possible alternative
a long narrow depression in a surface	the initial part of the introduction
a chance to do something	the first performance (as of a theatrical production)
	a ceremony accompanying the start of some enterprise
	an open or empty space in or between things
	opportunity especially for employment or promotion

crack (adjective)	opening (adjective)
of the highest quality	first or beginning

crack (verb)	opening (verb)
break suddenly and abruptly, as under tension
become fractured; break or crack on the surface only
break partially but keep its integrity
cause to become cracked
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