My "Phrases in English" site supports both the functions you are looking for, and is of course free:
>> I'm very interested in finding a list of n-letter English words: I'm mostly
after 4 and 5 letter words
from http://pie.usna.edu/explore.html look for 1-grams of length n with a query string of n ? , e.g.
????
to find 4-letter words (yes, you'll find those in there too!) * optionally you can filter by PoS as well
>> I'm also interested in two-letter character groupings; that are normally
found in English, and that are pronounceable -
from the "chargrams" page http://pie.usna.edu/explorec.html you can look for 2-chargrams. Optionally you can specify position (initial, medial, final) and type of frequency (type / token). Unfortunately there is no provision for weeding out the unpronoudeable ones automatically.
Good luck,
Bill
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