There are 15 words that start with 'splend'.
| splendid | splendor | 
| splendent | splendors | 
| splendour | splendider | 
| splendidly | splendours | 
| splendrous | splendidest | 
| splendorous | splendidness | 
| splendiferous | splendidnesses | 
| splendiferously | |
Note: These 15 words that start with 'splend' are found from the USA & Canada version of the tournament Scrabble word list.