Here's why:
* Polysemy: This refers to a single word having multiple related meanings.
* Homophony: This refers to different words that sound the same but have different meanings and spellings.
The word "gauge" has multiple related meanings, including:
* To measure: "The mechanic gauged the tire pressure."
* A measuring instrument: "The fuel gauge showed the car was almost empty."
* A standard size or width: "The railroad tracks are standard gauge."
Since these meanings are all related to the concept of measurement, they are considered polysemous.