裸体 (luǒ tǐ) is a noun/verb meaning 'naked body' or 'nudity', focusing on the state of being unclothed. It differs from 裸露 (luǒ lù), which describes something exposed or uncovered (e.g., rocks, wires), and from 裸 (luǒ), which is a verb used in compounds like 裸婚 (bare-bones marriage). 人体 (rén tǐ) simply means 'human body' without implying undress.