Um, I've seen "tom-tom" written as "tam-tam" before.
Here's a list of all letter combinations -- under one page of code to generate them. (Three cheers for Prolog!)
http://web.unbc.ca/~mcnamarg/words.zip
Code if you'd rather generate your own:
%
% letpuz.pl
% To get 6 letter combinations, call getSolutions(6,myfile).
getSolutions(Length, Filename) :-
tell(Filename),
writeSolutions(Length),
!,
told.
writeSolutions(M) :-
solution(M, S),
writeSol(S),
nl,
fail.
writeSolutions(_).
solution(0,[]) :- !.
solution(N, [Let|R]) :-
letter(Let),
M is N-1,
solution(M, R).
writeSol([]).
writeSol([A|R]) :-
write(A),
!,
writeSol(R).
letter(a).
letter(d).
letter(g).
letter(j).
letter(m).
letter(p).
letter(t).
letter(w).