what part of speech is of

The word "of" is a preposition.

Explanation:

• Prepositions are words that show relationships between a noun (or pronoun) and other words in a sentence.

• "Of" often indicates belonging, origin, composition, or association.
  For example:

  • "The cover of the book" (shows possession)
  • "A cup of tea" (shows composition)
  • "A man of honor" (shows association)

If you want, I can provide more examples or explain other parts of speech!