There are 15 words that start with 'mercu'.
| mercury | mercuric |
| mercurate | mercurial |
| mercuries | mercurous |
| mercurated | mercurates |
| mercurials | mercurating |
| mercuration | mercurially |
| mercurations | mercurialness |
| mercurialnesses | |
Note: These 15 words that start with 'mercu' are found from the USA & Canada version of the tournament Scrabble word list.