Cranny

noun

1. A small opening, as in a wall or rock face; a crevice.
2. To become intersected with or penetrated by crannies, clefts, or crevices.
3. To enter by crannies; haunt crannies.
4. Pleasant; brisk; jovial.
5. Any small narrow opening, fissure, crevice, or chink, as in a wall, a rock, a tree, etc.