The word "iff" uses 3 letters: ffi.

IFF is playable in:

Words With Friends9
Scrabble US9
Scrabble UK9

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

Try a search for iff 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 iff (in bold), or to ffi in any order:

b - biff13

e - fief10 fife10

y - iffy12

j - jiff19

m - miff13

r - riff10

t - tiff10

Shorter words found within ffi

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