regard has 14 distinct synonyms spread across 10 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. 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.
paying particular notice (as to children or helpless people)
“his attentiveness to her wishes”
(usually plural) a polite expression of desire for someone's welfare
“give him my kind regards”
Synonyms, antonyms and the broader and narrower relations for regard come from Princeton University’s WordNet. Full sources and licences.