Autonyms are words used to describe one's own name or identity. The antonyms for autonyms are words used to describe names or identities of others. Some antonyms of autonyms could be heteronyms, which are words that have the same spelling but different pronunciation and meaning. Homonyms are another antonym for autonyms, which are words that have the same spelling and pronunciation but different meanings. Synonyms could also be considered the antonym of autonyms, as they refer to words with similar meanings. Lastly, pseudonyms, which are fake names used by a person, are also an antonym of autonyms.