The letter 'a' is a noun because it's a thing. All letters of the alphabet are nouns.
The word 'a' is an indefinite article. Articles are in the adjective part of speech.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech of "correct" in this sentence is an adjective.
It is a noun, the 14th letter of the Greek alphabet.
Articles like "a" or "an" are considered the shortest parts of speech, as they consist of only one letter.
The word dictate is a verb. Mrs. Jones will dictate a letter now.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.