There are 12 9-letter words that start with 'cong'.
| congealed | congealer | congeeing | 
| congeners | congenial | congeries | 
| congested | conglobed | conglobes | 
| congruent | congruity | congruous | 
Note: These 12 9-letter words that start with 'cong' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with congr, conge, congl, congo, conga, congi.
5-letter words start with 'cong' (3)