"Hard drive" may be regarded as a compound noun, but traditionally, "hard" would be regarded as an adjective and "drive" as a noun. A justification for considering the two word phrase a single noun is that this phrase implies considerably more than merely a drive that is hard; it also implies storage capacity and read and write memory as a computer component. A Golf stroke could also be called a "hard drive", for example, but in that instance the phrase has no substantial additional implications that are not comprehended within the normal meanings of "hard" and "drive" separately in the context.
The word drive is a verb. The past tense is drove.
An adjective--a hard surface.An adverb--work hard.
The word difficulty is a noun. A difficulty is something that is hard to do.
The word driving is a verb. It is the present participle of the verb drive.
Work is a verb in that example.
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 word "hardest" is an adjective, as it describes the superlative form of the adjective "hard."
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.