The word "flak" uses 4 letters: afkl.

FLAK is playable in:

Words With Friends12
Scrabble US11
Scrabble UK11

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

Try a search for flak 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 flak (in bold), or to afkl in any order:

c - flack16

e - flake13

y - flaky15

n - flank14

s - flask13

i - kalif13

Shorter words found within afkl

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