glow has 12 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.
the phenomenon of light emission by a body as its temperature is raised
a feeling of considerable warmth
“the glow of new love”
be exuberant or high-spirited
“Make the people's hearts glow”
Synonyms, antonyms and the broader and narrower relations for glow come from Princeton University’s WordNet. Full sources and licences.