are there any differences between a cap and a hat?
a cap and a hat
Yes.
Caps tend to be smaller and more informal-looking -- like baseball caps or whatever that was that Sherlock Holmes wore (a deerstalker?). I tend to think of them as only having a brim in front.
Hats tend to be larger or more formal in nature -- like fedoras, bowlers, cowboy hats. They usually have a brim all the way around.
This is a generalization, though; it's probably not always true.
Caps tend to be smaller and more informal-looking -- like baseball caps or whatever that was that Sherlock Holmes wore (a deerstalker?). I tend to think of them as only having a brim in front.
Hats tend to be larger or more formal in nature -- like fedoras, bowlers, cowboy hats. They usually have a brim all the way around.
This is a generalization, though; it's probably not always true.
I think of a cap as being a kind of hat (fitting the description above).
That's another good way to put it -- caps are a subset of hats in general.