Overfull and Too

Overfull adjective - Exceeding demand.

Too and overfull are semantically related. in excessively topic. In some cases you can use "Too" instead an adverb "Overfull", when it comes to topics like unduly.

Too adverb - Beyond a normal or acceptable limit.

Overfull and too are semantically related. You can use "Overfull" instead an adverb "Too".