There are 18 10-letter words that start with 'sin'.
| sincipital | sinfulness | singalongs |
| singleness | singletons | singletree |
| singspiels | singularly | sinicizing |
| sinisterly | sinistrous | sinoatrial |
| sinologies | sinologist | sinologues |
| sinsemilla | sinuations | sinusoidal |
Note: These 18 10-letter words that start with 'sin' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with sing, sinu, sinc, sino, sine, sini, sink, sinf, sint, sinl, sinn, sins, sina, sinh.
4-letter words start with 'sin' (5)