There are 15 10-letter words that start with 'bil'.
| bilberries | bilections | bilgewater | 
| bilharzial | bilharzias | bilinguals | 
| bilirubins | biliverdin | billabongs | 
| billboards | billfishes | billionths | 
| billowiest | billycocks | bilocation | 
Note: These 15 10-letter words that start with 'bil' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with bill, bili, bila, bilb, bilg, bilo, bile, bilk, bilh, bild, bils, bilt.
4-letter words start with 'bil' (3)