The word "kickboxings" uses 11 letters: bcgiikknosx.

KICKBOXINGS is playable in:

Words With Friends35
Scrabble US31
Scrabble UK31

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

Try a search for kickboxings 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 kickboxings (in bold), or to bcgiikknosx in any order:

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

Shorter words found within bcgiikknosx

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