There are 12 7-letter words that start with 'radi'.
| radiale | radials | radians | radiant | 
| radiate | radical | radicel | radices | 
| radicle | radioed | radiums | radixes | 
Note: These 12 7-letter words that start with 'radi' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with radio, radic, radia, radiu, radis, radix, radii.
5-letter words start with 'radi' (3)