Which part of speech serves as a word to express strong feelings or emotions?

The correct answer is interjection, as interjections are specifically designed to convey strong feelings or emotions. This part of speech often expresses excitement, surprise, joy, or frustration in a concise manner. For instance, words like "Wow!", "Oh no!", and "Yay!" clearly demonstrate emotional responses and can stand alone or be inserted within sentences to convey the speaker's feelings effectively.

The other parts of speech do have important functions but do not serve the same purpose as interjections. Adjectives describe nouns and provide details about them, but they do not express emotions directly. Pronouns substitute for nouns and help with sentence structure without conveying feelings on their own. Conjunctions connect words, phrases, or clauses, again without expressing emotions or feelings. Thus, interjections are unique among these options for their direct emotional expression.