There are 21 words that start with 'hallo'.
| hallo | halloa | halloo |
| hallos | hallot | hallow |
| halloas | halloed | halloes |
| halloos | halloth | hallows |
| halloaed | halloing | hallooed |
| hallowed | hallower | halloaing |
| hallooing | hallowers | hallowing |
Note: These 21 words that start with 'hallo' are found from the USA & Canada version of the tournament Scrabble word list.