glass has 20 distinct synonyms spread across 8 of its 12 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a brittle transparent solid with irregular atomic structure
a container made of glass for holding liquids while drinking
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
glassware collectively
“She collected old glass”
scan (game in the forest) with binoculars
become glassy or take on a glass-like appearance
“Her eyes glaze over when she is bored”
Synonyms, antonyms and the broader and narrower relations for glass come from Princeton University’s WordNet. Full sources and licences.