The only hitch is making sure that the DICT contains all the possible legal words. E.g. your typical /usr/dict/words isn't likely to have "seams" in it, so you'd have to generate it.

False problem, I think. See the original spec:

The mystery word(s) should be able to be found in most any english dictionary

None of my (paper) English dictionaries has an entry for "seams" :-)