There are 15 words that start with 'prebo'.
preboil | prebook | preboom |
preboard | preboils | prebooks |
prebound | preboards | preboiled |
prebooked | prebought | preboarded |
preboiling | prebooking | preboarding |
Note: These 15 words that start with 'prebo' are found from the USA & Canada version of the tournament Scrabble word list.