There are 16 words that start with 'naph'.
| naphtha | naphtol |
| naphthas | naphthol |
| naphthyl | naphtols |
| naphthene | naphthols |
| naphthous | naphthyls |
| naphthenes | naphthenic |
| naphthalene | naphthalenes |
| naphthylamine | naphthylamines |
Note: These 16 words that start with 'naph' are found from the USA & Canada version of the tournament Scrabble word list.