Parts of speech aren’t always fixed—many words can switch roles depending on how they’re used. For example, “Google” is usually a noun (a company), but in a sentence like “I’ll google it,” it becomes a verb. Also, English has a flexible category called “conversion” or “zero-derivation,” where a word changes its part of speech without any change in form. This shows that parts of speech are not just about the word itself, but about how it functions in a sentence.
