"Ouch" is an interjection*, which sometimes now seems to be called an ejaculation.
*I learned parts of speech in the 1950s.
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.
interjection
Ouch! Its so painful! (it has to be as speech, can only really be used by itself because it is used as an exclamation)
The Part of Speech that either expresses a feeling or sensation (Wow, ouch, oh), or imitates a sound (splash, whoosh, ssht).
The part of speech for this particular word is a noun.
The part of speech that the word my is used as is an adjective.
ouch
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word diplomacy is a noun.
The part of speech for the word "boulevard" 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 this particular word is a noun.