Premise: But between water and watt there are fifty-four main entries in Cobuild and 148 in CED . They share such entries as water biscuit and waterworks . But in addition CED alone enters water measurer (a `bug'), Watford (a `town north of London'), etc.

Hypothesis: Cobuild had originally included several of the terms included in CED, but removed them for being too niche.
Relation: neutral