There are 12 words that start with 'retard'.
| retard | retards | retarded |
| retarder | retardant | retardate |
| retarders | retarding | retardants |
| retardates | retardation | retardations |
Note: These 12 words that start with 'retard' are found from the USA & Canada version of the tournament Scrabble word list.