crevice

OPENING
WordClue
GAPopening, hole
HOLEopening in the surface of an object
POREtiny opening in the skin
SLITnarrow cut or opening
WINDOWtransparent or translucent opening
CREVICEopening
FISSUREcrack or opening, as in a rock
PEEPHOLEglass opening in door
DISEASECreutzfeldt-Jakob or Hashimoto's
OPENINGcrevice, gap