There are 11 words that start with 'curio'.
| curio | curios | 
| curiosa | curious | 
| curiosity | curiouser | 
| curiously | curiousest | 
| curiosities | curiousness | 
| curiousnesses | |
Note: These 11 words that start with 'curio' are found from the USA & Canada version of the tournament Scrabble word list.