The part of speech that the word my is used as is an adjective.
A suffix changes a word's part of speech. For example, the word 'happy' is an adjective. But when you add a suffix, which is an ending, it can change the part of speech. Happily is an adverb. Happiness is a noun.
for
it depends what word it is it could be any part of speech depending on the sentence
The word power is a noun. The plural form is powers.
The part of speech for the word diplomacy is a noun.
The part of speech for the word civilian is English grammar.
The word speech is a noun.
The part of speech for oscillate is verb.
The part of speech for the word bashed is verb.
Word is a noun.
Cavorted belongs to the part of speech called the verb.
The word understand is a verb. The past tense is understood.
noun
preposition
The word "I" is a pronoun.
Me is a pronoun.