what kind of word is of

The word "of" is primarily a preposition. It is used to show relationships such as belonging, origin, possession, connection, or association between two entities. For example, in phrases like "the color of the sky" or "a man of honor," "of" indicates a relationship between the nouns. Additionally, "of" can sometimes appear as a nonstandard auxiliary verb form in place of "have" but this usage is much less common and typically considered informal or dialectal. The main and standard role remains that of a preposition.