The term 'Tiny Opening' can be described by four different crossword solutions: PORE (4 letters), Micro (5 letters), PINHOLE (7 letters), and TEE (3 letters). A PORE is a small opening in the skin, while a micro is an extremely small object. A PINHOLE is a very small hole, and an itty is an informal term for something that is very small. All of these words describe a tiny opening, which is a very small opening or hole.