moderate has 20 distinct synonyms spread across 8 of its 10 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 immoderate.
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.
make less fast or intense
“moderate your speed”
being within reasonable or average limits; not excessive or extreme
“moderate prices”
a person who takes a position in the political center
Synonyms, antonyms and the broader and narrower relations for moderate come from Princeton University’s WordNet. Full sources and licences.