There are 17 words that start with 'flop'.
| flop | flops | floppy | 
| flopped | flopper | flopover | 
| floppers | floppier | floppies | 
| floppily | flopping | flophouse | 
| flopovers | floppiest | flophouses | 
| floppiness | floppinesses | |
Note: These 17 words that start with 'flop' are found from the USA & Canada version of the tournament Scrabble word list.