mouth

noun:the opening in the face through which a person or animal eats, drinks, and speaks
- She smiled, showing her bright, healthy mouth.
noun:the opening where a river flows into a larger body of water
- The Mississippi River mouth is a massive delta that empties into the Gulf of Mexico.
noun:the opening at the top of a container such as a bottle, cup, or pipe
- He twisted off the bottle's mouth and poured the wine.
noun:the entrance or opening of a cave, tunnel, or similar hollow structure
- They entered the cave through its wide mouth.
noun:a person who talks a lot, especially in a noisy or gossipy way
- Everyone knew him as the office mouth, always gossiping about the latest news.