6 letter word: E B D K C A

6 letter word
Backed

5 letter word
Caked
Baked

4 letter word
Deck
Dace - small, freshwater cyprinoid fish, Leuciscus leuciscus, of Europe, having a stout, fusiform body.
Cake
Beck - a bow or curtsy of greeting. (Also beckon)
Beak
Bead
Bake
Bade
Back
Aced

3 letter word
Deb - debutante
Dab
Cad
Cab
Bed
Bad
Ace