There are 12 14-letter words that start with 'inf'.
| infectiousness | infelicitously | 
| infinitenesses | infinitesimals | 
| inflammability | inflammatorily | 
| inflectionally | inflexibleness | 
| inflorescences | infrangibility | 
| infrastructure | infusibilities | 
Note: These 12 14-letter words that start with 'inf' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with infl, infe, infi, infa, info, infr, infu.
4-letter words start with 'inf' (1)