crouton, dry toast, rusk, and toasted bread

[LewisJian]

Hi,
I'm confused by crouton, dry toast, rusk, and toasted bread. Are they basically the same stuff? Thanks,

 

[GoesStation]

Croutons are small, roughly cubical pieces of toasted bread, often with some seasoning.
Dry toast is toasted bread without butter or any other spread.
According to Wikipedia, a rusk is "...a hard, dry biscuit or a twice-baked bread." We always called this Zweiback in my family when I was growing up.
Toasted bread is bread which has been dried and browned, usually in a toaster.

 

[Tarheel]

It's usually just called toast.

 

[Tdol]

Croutons are small, roughly cubical pieces of toasted bread, often with some seasoning.

They are also usually found added to food like soups and salads.