sunrise has 11 distinct synonyms spread across 1 of its 4 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. Its one recorded opposite is sunset.
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 first light of day
“we got up before dawn”
atmospheric phenomena accompanying the daily appearance of the sun
the daily event of the sun rising above the horizon
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for sunrise.
Synonyms, antonyms and the broader and narrower relations for sunrise come from Princeton University’s WordNet. Full sources and licences.