There are 16 words that start with 'leng'.
| length | lengths |
| lengthy | lengthen |
| lengthens | lengthier |
| lengthily | lengthened |
| lengthener | lengthiest |
| lengthways | lengthwise |
| lengtheners | lengthening |
| lengthiness | lengthinesses |
Note: These 16 words that start with 'leng' are found from the USA & Canada version of the tournament Scrabble word list.