WordNet: cleft, crack, crevice, fissure, scissure

a long narrow opening

• hypernym gap, opening

• hyponym chap

• hyponym chink

• hyponym crevasse

• hyponym fatigue crack

• hyponym break, fault, faulting, fracture, geological fault, shift

• hyponym rift

• hyponym slit

• hyponym split

• hyponym vent, volcano

cleft

• (suomi) halkeama (synonyymi)

crack

• (englanti) crack (derivationally related)
• (suomi) halkeama (synonyymi)

crevice

• (suomi) rako (synonyymi)

fissure

• (englanti) fissure (derivationally related)
• (suomi) rako (synonyymi)

scissure

• (suomi) halkeama (synonyymi)