There are 18 words that end with 'ghtly'.
lightly | nightly | sightly |
rightly | tightly | brightly |
knightly | slightly | sprightly |
unsightly | uprightly | midnightly |
outrightly | straightly | downrightly |
fortnightly | distraughtly | forthrightly |
Note: These 18 words that end with 'ghtly' are found from the USA & Canada version of the tournament Scrabble word list.