Noun
cracks [sing. a crack]
incisions [sing. an incision]
notches [sing. a notch]
fissures [sing. a fissure]
crevices [sing. a crevice]
slits [sing. a slit]
furrows [sing. a furrow]
crannies [sing. a cranny]
clefts [sing. a cleft]
cleavages [sing. a cleavage]