Complicating the issue further is the fact that most usages of terms are based on similarity to an example set (hence the complete hilarity that ensues when you ask anyone at all to define woman and push them just a tiny bit, because they almost invariably try to delimit the borders with crisp rules), not a collection of logical rules for determining set membership.

For instance, some objects are pots, some are pans, and some are not clearly one or the other. Thankfully, we don't have "saute pans are pots!" culture clashes.