A bit confused here: why are you including past tenses such as knelt and knew (with kneel and know) if you're excluding knocking and knighted? the only difference between those two is that the first set of past tenses are irregular. If including irregular, why not regular?
You may want to clarify the instructions. They now say excluding suffixes of words already on this list, but you've included several suffixed words (knowledgeable, for example)