como

Como (without accent) functions as a conjunction meaning "as" or "like," introducing comparisons and manner clauses. Cómo (with accent) is the interrogative and exclamatory form meaning "how." Both are extremely common and the accent mark is the only written distinction.

The pitfall is in reported or indirect questions: "Me preguntó cómo me llamaba" (She asked me what my name was) requires the accent because the sense is interrogative even though there is no question mark. Many learners drop the accent in these embedded questions, which is technically incorrect in formal writing.