There are 12 15-letter words that start with 'cy'.
| cyanocobalamine | cyanocobalamins |
| cyanoethylating | cyanoethylation |
| cyclohexylamine | cyproheptadines |
| cytochemistries | cytogenetically |
| cytogeneticists | cytomegalovirus |
| cytophotometric | cytoplasmically |
Note: These 12 15-letter words that start with 'cy' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with cyc, cyt, cya, cym, cys, cyb, cyp, cyl, cyn, cyd, cye, cyg.
4-letter words start with 'cy' (4)