"Frugal"
No word contains only the letters f t and h. A word that contains all 3 in that order is faith.
forehead
The word fitful can be made with those letters.
There are several letters (such as: f, i, n, s) that can be added to the word, letter, to make a new word. Example: fettler, retitle, nettler, trestle.
make u fool
These letters can be unscrambled to make "powerful".
Those letters spell problem.
The letters "ou" make the "f" sound in the word "rough."
The word you can make with the letters e, f, i, p, and r is "frie." Additionally, you can also form the word "fire."
Just f makes the ffff sound, the other letters make up the first part of the word.
The missing letters F and C make the word deflects.
The 6-letter word you can make from the letters F, E, E, I, I, O, R, S is "OFFERS."
The word you can make with the letters f, r, z, o, and e is "froze."
alfaki
The letters spell the word effects. The word uses all seven letters.
Flout.
centrifuge