There are 13 words that start with 'muci'.
| mucid | mucin | 
| mucins | mucidity | 
| mucilage | mucinoid | 
| mucinous | mucilages | 
| mucinogen | mucidities | 
| mucinogens | mucilaginous | 
| mucilaginously | |
Note: These 13 words that start with 'muci' are found from the USA & Canada version of the tournament Scrabble word list.