There are 15 12-letter words that start with 'expe'.
| expectancies | expectations | expectedness | 
| expectorants | expectorated | expectorates | 
| expediencies | expediential | expenditures | 
| experiencing | experiential | experimental | 
| experimented | experimenter | expertnesses | 
Note: These 15 12-letter words that start with 'expe' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with exper, expec, exped, expen, expel.
5-letter words start with 'expe' (1)