罅割れ[hibiware] crack
罅焼き[hibiyaki] crackleware
罅ぜる[hazeru] to burst open
罅が入る[hibigahairu] to get cracked

罅割れる[hibiwareru] to crack
裂罅[rekka] fissure
罅隙[kogeki] crack

隙人[himajin] man of leisure
間隙[kangeki] gap
空隙[kuugeki] vacant space
隙き間[sukima] crevice
手隙[teaki] not busy

手間隙[temahima] time and effort
寸隙[sungeki] spare time
隙間風[sukimakaze] draft
隙かさず[sukasazu] without a moment's delay