earthly 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 heavenly.
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 characteristic of this earth as distinguished from heaven
“earthly beings”
Synonyms, antonyms and the broader and narrower relations for earthly come from Princeton University’s WordNet. Full sources and licences.