A root word refers to a word that works as a basic unit and base for other words that are created by adding prefixes (syllable before the root word) or suffixes (syllables after the root word). Additionally, some words are written similarly but do not share the same root word. In the case of the root word "theo" that means God this can be seen in the word "Polytheism" in which the prefix "poly" means many, "theo" means "god" and "ism" is a suffix that expresses condition, action, etc and this leads to "polytheism" meaning the practice of believing in multiple gods. Additionally, in others the root word is not "theo", for example in "thermometer" the root word is "thermo" that means temperature and the word "theory" derives from Greek and its root means to look at. Therefore, the word that also contains the Latin root "theo" is Polytheism.
