How do you say "Reloj" in English?

Some will say CLOCK and others will say WATCH. Both are correct, however, there is a  slight difference between one and the other. Take the Big Ben for example which appears in the pic. It is perhaps the most famous clock in the world (it even has a nickname of its own), but it's definitely not a watch. Citizen is a company famous for the watches they produce because they are elegant, practical, stylish; and still you would never put one of them on one of the walls of your living room.

Is size the difference then? No. There are clocks of all sizes, many of them smaller than a standard watch. Now, most watches have similar sizes. There are no watches larger than a fist unless they have some promotional objective.

The difference is in the purpose. The only purpose of a clock is to tell time which is why they are made large and are usually placed in prominent places so eveyone can see them at all times. Watches are also used to tell time but they are considered part of our everyday look. We wear watches (which is why they have straps/bracelets) while clocks cannot be worn because they were not made for that.

In Spanish that difference does not exist. The term RELOJ DE MUÑEQUERA (wristwatch) is in dictionaries but very few people use it leading to a singular confusion: learners can tell apart a clock from a watch but honestly believe (no one took the time to explain to them) the distinction between one and the other is only a matter of size.