Too many uncertainties here for my liking. Alder/Elder, Octet/Octad, Dither/Dodder, Defer/Deter, and probably a couple more. I've gone for the first-named, but my confidence is ebbing away, particularly on Octet/Dither, Dither fits for unsteady meaning indecisive, but it is a slight stretch. I'll have tippexed it several times before I send it.