There are 230 words that start with 'semi'.
Note: These 230 words that start with 'semi' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with semic, semid, semin, semio, semip, semit, semia, semim, semis, semil, semif, semir, semig, semih, semiw, semib, semie, semiq, semiv, semiu, semiy.
5-letter words start with 'semi' (1)