Basileiolatry is a rare word that refers to the worship of kings or rulers. Synonyms for this word include regidiolatry, monarcholatry, and king-worship. Regidiolatry is a combination of regis meaning king and theolatry meaning worship, which makes it a perfect alternative to basileiolatry. Monarcholatry is another synonym for basileiolatry that is formed by combining monarchy, meaning a system of government led by a single person, and theolatry. While king-worship is a more straightforward alternative, it is less commonly used. However, all of these words can be used interchangeably and effectively convey the meaning of basileiolatry.