water gauge vs water glass

water gauge and water glass both are nouns.

Word	Noun	Adjective	Verb	Adverb
water gauge	Yes	No	No	No
water glass	Yes	No	No	No

As nouns, water gauge and water glass are synonyms defined as:

water gauge and water glass: gauge for indicating the level of water in e.g. a tank or boiler or reservoir

Other synonyms of water gauge include water gage.

water gauge (noun)	water glass (noun)
gauge for indicating the level of water in e.g. a tank or boiler or reservoir	a glass for drinking water
	gauge for indicating the level of water in e.g. a tank or boiler or reservoir
	clock that measures time by the escape of water
	a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs