The Quenya word for heart is hón (physical heart).
The Sindarin word for heart is hûn (physical heart).
There are other words for heart in the moral and spiritual sense, and heart in inner thought and resolve. In Quenya these words are órë (heart, inner mind, spirit) and indo (heart, mood, resolve, will). In Sindarin they are gûr (heart in the moral sense) and ind (inner thought, meaning, heart).