human has 3 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 nonhuman.
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.
having human form or attributes as opposed to those of animals or divine beings
“human beings”
any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage
2 of the 4 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for human.
Synonyms, antonyms and the broader and narrower relations for human come from Princeton University’s WordNet. Full sources and licences.