There are 16 words that start with 'retar'.
retard | retards | retarded |
retarder | retarget | retardant |
retardate | retarders | retarding |
retargets | retardants | retardates |
retargeted | retardation | retargeting |
retardations | ||
Note: These 16 words that start with 'retar' are found from the USA & Canada version of the tournament Scrabble word list.