There are 11 13-letter words that start with 'hel'.
| helicoptering | heliographing |
| heliotropisms | hellenization |
| hellgrammites | hellishnesses |
| helminthiases | helminthiasis |
| helminthology | helmsmanships |
| helpfulnesses | |
Note: These 11 13-letter words that start with 'hel' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with heli, hell, helm, help, helo, helv, held.
4-letter words start with 'hel' (5)