There are 8 13-letter words that start with 'bel'.
| belatednesses | beleaguerment | 
| believability | belittlements | 
| bellicosities | belligerences | 
| belligerently | belongingness | 
Note: These 8 13-letter words that start with 'bel' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with bell, beli, bela, belo, bele, belt, belc, beld, belf, belg, belu, belv, bels, bely.
4-letter words start with 'bel' (3)