[Eleutheria5]

So all those “Wet Cement” signs are wrong, and one must call cement mixers “concrete mixers”? In spoken English the two are interchangeable, regardless of what they’re called among contractors, to whom the difference is meaningful.

[metesky]

One either knows the nomenclature and speaks correctly, or doesn't and takes the chance that one's audience can somehow infer the correct meaning.

Cement

Concrete

Cement as you can see, is a binder that holds the aggregate together. Flour is a binder, but you don't call bread and cakes "flour" do you?

Now, go forth and make a concrete effort to cement a relationship with some one, anyone...