There are 18 words that start with 'eigh'.
| eight | eighth | eights | 
| eighty | eighths | eightvo | 
| eighteen | eighthly | eighties | 
| eightvos | eightball | eighteens | 
| eightfold | eightieth | eightballs | 
| eighteenth | eightieths | eighteenths | 
Note: These 18 words that start with 'eigh' are found from the USA & Canada version of the tournament Scrabble word list.