There are 272,782 word types in the British National Corpus that are not in the first 20
word lists used with the Range program, plus a list of proper nouns, a list of transparent
compounds, and a list of exclamations, hesitations and other spoken marginal words.
Note in Table 5 that almost half of the different words are proper nouns. Four percent are
foreign words, and 6% are low frequency members of word families already in the 20 one
thousand word lists. Ideally, these family members should be added to the families in the
existing lists.