There are 10 words that end with 'onins'.
| conins | saponins | opsonins |
| thionins | santonins | troponins |
| digitonins | melatonins | serotonins |
| calcitonins | ||
Note: These 10 words that end with 'onins' are found from the USA & Canada version of the tournament Scrabble word list.