There are 3 4-letter words that start with 'rh'.
rhea | rhos | rhus | ||
Note: These 3 4-letter words that start with 'rh' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with rhe, rhi, rho, rha, rhy, rhu.
3-letter words start with 'rh' (1)