In the English language, every word is called a part of speech. The role a word plays in a sentence denotes what part of speech it belongs to. Explore the definition of parts of speech, the different parts of speech and examples in this article. There are eight parts of speech in the English language: noun, pronoun, verb, adjective, adverb, preposition, conjunction, and interjection. The part of speech indicates how the word functions in meaning as well as grammatically within the sentence.