What part of speech is the word my?
"my" is the possessive form of the pronoun "I"
The term "part of speech" is a noun phrase, which is any word or group of words based on a noun or pronoun (without a verb) that can function in a sentence as a subject, object of a verb or a preposition. A noun phrase can be one word or many words. The word "part" is a noun, "of" is a preposition, and "speech" is a noun. object of the preposition.