I learn confusing vocabulary best visually, so I want to try to clarify this a bit using pictures.
Cuenco o Bol:
[Bol more often used for larger bowls]
Tazón:
Plato hondo:
The above seem to be the most distinct uses of these various words that I have picked up on. However, it seems many people/dialects use each of these words more broadly (or synonymously) or even not at all.
- As pointed out in other answersanother answer, some dialects seem to just use Plato with certain context words to refer to bowls.
(Note: I am a native English speaker trying to relearn Spanish, so if you disagree, have further input, better pictures, etc., please update or comment. Thanks!)