backfit

The word backfit uses 7 letters:abcfikt.

BACKFIT is playable in:

Words With Friends20
Scrabble US18
Scrabble UK18

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

Try a search for backfit in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
Each search will normally open in a new window.