There are 13 words that start with 'excret'.
| excreta | excrete | excretal | 
| excreted | excreter | excretes | 
| excreters | excreting | excretion | 
| excretive | excretory | excretions | 
| excretories | ||
Note: These 13 words that start with 'excret' are found from the USA & Canada version of the tournament Scrabble word list.