Some words that have both F and J in them are:
words with two T's and an F: * flatter * flutter * fatty * flatten * frustration * fainthearted * farthest * footstool * fattest * fastest * fatten * filtration * flirtation * fertilization * forethought * festivity * fictitious * fermentation * fitting * frostiest * flashiest * faintest * fittest * footnote * footprint * footstep * footpath * fortunate * fretted * fatted * forefather * forecast * forefront * foremost * foresight * forestall * fatality * functionality * fortification * fortunately * fortnight * fortitude * fourteenth * fifteenth * fortieth * fiftieth * fortuitous * fictitious * factitious * fluctuation * factorization * fraternity * flatulent * fritter * frothiest * furthest * futility
Words that have a double "f" are:
affair
affect
bluff
buff
buffalo
buffoon
cliff
coffin
cuff
daffodil
differ
effect
effervescent
effort
fluff
graffiti
griffin
gruff
huff
muff
muffin
muffle
off
offer
office
official
puff
puffin
raffle
ruffle
scuffle
sheriff
shuffle
stiff
stuff
suffer
taffy
tariff
traffic
waffle
whiff
tuff ummm...forfeit? off faithful
Affaire, of,
if. of.
Fair, fear and four are 4 letter words. They begin with f and end with r.
Some words that start and end with letter F are:fallofffireproofflagstafffluffflyleaffoodstufffoolproof
There are no 5 letter words in the English language that begin with r and end with f.
Of and If
For,from,fin,fine,fantasic just,jail,jump
firefox
Faint, fault, fight, fleet, flint, flirt, frost and fruit are 5 letter words. They start with F and end with T.
Feathers is a eight letter word that starts with f and ends in s.
frisk frank flick fleck frock
cafe, fife, giraffe, life, knife, safe, wife
In American English, it is extremely rare for a plural word to end in a letter outside of "S".
leaf and I don't know the rest I'm sorry