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diurnal has no recorded synonym. 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 nocturnal.
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.
of or belonging to or active during the day
“diurnal animals are active during the day”
1 of the 2 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 diurnal.
Synonyms, antonyms and the broader and narrower relations for diurnal come from Princeton University’s WordNet. Full sources and licences.