The word "ef" uses 2 letters: ef.

EF is playable in:

Words With Friends5
Scrabble US5
Scrabble UK5

ef is a valid word in this word list. For a definition, see the external dictionary links below.

Try a search for ef in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
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Words formed by adding one letter before or after ef (in bold), or to ef in any order:

f - eff9

s - efs6

t - eft6 fet6

l - elf7

m - emf9 fem9

d - fed7

e - fee6

h - feh8

n - fen7

r - fer6 ref6

u - feu7

w - few9

y - fey8

z - fez15

i - fie6

o - foe6

k - kef10

Shorter words found within ef

Adding one letter to ef does not form any other word in Words With Friends word list.

List all words that start with Q, adjectives that start with Q or find all 5 letter words starting with Q

List all words by word length, browse all words in the list, explore all combinations of letters or find all adjectives starting with a letter

Words with all letters different - Letter pairs and double letters - Hook Word Lists