There are 15 words that end with 'astics'.
| mastics | clastics |
| elastics | plastics |
| spastics | monastics |
| gymnastics | euplastics |
| fantastics | onomastics |
| nonplastics | scholastics |
| slimnastics | ecclesiastics |
| thermoplastics | |
Note: These 15 words that end with 'astics' are found from the USA & Canada version of the tournament Scrabble word list.