glass vs water glass

glass and water glass both are nouns.

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

As nouns, water glass is a hyponym of glass; that is, water glass is a word with a more specific, narrower meaning than glass:

As nouns, water glass is a hyponym of glass; that is, water glass is a word with a more specific, narrower meaning than glass:

glass: a brittle transparent solid with irregular atomic structure
water glass: a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs

glass (noun)	water glass (noun)
a container made of glass for holding liquids while drinking	a glass for drinking water
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant	gauge for indicating the level of water in e.g. a tank or boiler or reservoir
a mirror; usually a ladies' dressing mirror	clock that measures time by the escape of water
a small refracting telescope	a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs
glassware collectively
the quantity a glass will hold
a brittle transparent solid with irregular atomic structure

glass (verb)	water glass (verb)
become glassy or take on a glass-like appearance
put in a glass container
enclose with glass
scan (game in the forest) with binoculars
furnish with glass