Adjective
"Unusual" is used as an adjective. e.g. The unusual boy stuttered as he spoke. "unusual" is modifying "boy". Only adjectives modify nouns and pronouns.
It is a unusual word.
A vocabulary list should always include the pronunciation, if unusual, the part of speech, and possibly a close synonym or related word.
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.
In this sentence, the word "connoisseur" 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 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.
It is not ANY part of speech, there is no such English word as "stroobly".