It would depend on the sentence.
The show was very exciting. (adj)
The farmer was exciting the bull in order to collect a semen sample. (verb)
The word enthusiastic is an adjective. It means in an excited manner.
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.
The part of speech for the word diplomacy is a noun.
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 "boulevard" is a noun.
The part of speech for the word civilian is English grammar.
The word speech is a noun.
In this example, "excited" is an adjective. It is a predicate adjective, because it follows the linking verb "are". An example of using "excited" as a verb is, "His arrival excited the dogs, and they began to bark."
It is not ANY part of speech, there is no such English word as "stroobly".
The part of speech for this particular word is a noun.
The word speech is a noun.