a2-a4, a4-a5, a5-a6, a6-a7. a7-a8(R) 
Chess Word-Chains
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Not quite what I had in mind....do you chew chesspieces when you play?
Pawn - dawn - down - mown - moan - moon - moot - boot - book - rook is my best try so far....
Good try, right idea anyway. I am still trying to remember the second one's solution but I have both for the first one.
Pawn - Sawn - Sown - Soon - Boon - Book - Rook
Amazingly close rooperi but theres a legal word you dont know that fits in there - I was using a dictionary when I devised it.
My wife reminds me that this is something I came up with on our wedding day much to her disgust. I could barely stop laughing - 15 years and she still hasnt forgiven me.
SPOILER - DO NOT READ IF YOU DONT WANT ANSWERS....
Pawn-Sawn-Sown-Soon-Sook-Rook (A sook is a variant spelling of arab marketplace "suk" - check it!)
Chess-Cress-Crass-Brass-Brats-Boats-Boars-Board.
Geez, so close....
Yoou almost went from WEDDING to DIVORCE in only 1 step :)
Lewis Carroll invented Word-Chains, in addition to using chess as a core scene in Alice through the looking glass (not to spoil it too much, she is a pawn on a chessboard). Here are 2 of mine - the object is to make word A into word B using no more than the set number of steps, making a legal word each time.
Promote PAWN - ROOK in 5 moves.
Make CHESS - BOARD in 7 steps.
The first one has 2 solutions if I remember right (did this years ago for a Scottish correspondence chess mag), the second one had just one, can't remember second one off-hand but I know it's there, lol.
Also check out my chess poem "The Ballad of Appon". Thanks.