Does accepting 'On the other hand, the shared main entry for watershed has twenty-three words in CED but 93 in Cobuild .  And the word waterless is a main entry in Cobuild , explained in twenty words, whereas in CED it is naught but a so-called  undefined runon 'merely mentioned, but not explained explicitly, as a sub-entry at water .  So CED enters more items than Cobuild , but devotes less space to explaining them.' as true logically compel one to accept 'Cobuild uses more space to explain items but has fewer entries than CED.'
On the other hand, the shared main entry for watershed has twenty-three words in CED but 93 in Cobuild .  And the word waterless is a main entry in Cobuild , explained in twenty words, whereas in CED it is naught but a so-called  undefined runon 'merely mentioned, but not explained explicitly, as a sub-entry at water .  So CED enters more items than Cobuild , but devotes less space to explaining them.###Cobuild uses more space to explain items but has fewer entries than CED.