what is the difference between congenital and acquired
Acquired deafness contrasts to congenital deafness which is present at birth. The distinction between acquired and congenital deafness specifies only the time that the deafness appears. It does not specify whether the cause of the deafness is genetic (inherited). Acquired deafness may or may not be genetic. For example, it may be a manifestation of a delayed-onset form of genetic deafness.
Congenital heart disease refers to structural problems with the heart that are present at birth. They can affect various different parts of the heart. For example, people are commonly aware of things like holes in the heart, where between two heart chambers there's actually a perferation. Sometimes very tiny, sometimes something that will close up over a few days or weeks, but sometimes something that needs to be closed itself with surgery over a period of time.