There are 19 words that start with 'slug'.
| slug | slugs | 
| slugged | slugger | 
| slugabed | slugfest | 
| sluggard | sluggers | 
| slugging | sluggish | 
| slugabeds | slugfests | 
| sluggards | sluggardly | 
| sluggishly | sluggardness | 
| sluggishness | sluggardnesses | 
| sluggishnesses | |
Note: These 19 words that start with 'slug' are found from the USA & Canada version of the tournament Scrabble word list.