Most likely:
* friend and frighten
Other possibilities:
* fringe and frivolous
* frigid and frisk
* frill and frolic
The best choice will depend on the specific dictionary and the other words included on that page.
Most likely:
* friend and frighten
Other possibilities:
* fringe and frivolous
* frigid and frisk
* frill and frolic
The best choice will depend on the specific dictionary and the other words included on that page.