There are no antonyms of fishing because it is an activity. You could put another activity like playing football but thats not an opposite.
The homonym for senile is "seine" which refers to a type of fishing net or river in France.
The answer is which, but you mean homophone, not homonym.
The homonym of "drenched" is "drentched."
Hour is a homonym for our.
The homonym for "mourning" is "morning".
A homonym for "grays" is "greys."
The homonym for 'census' is 'sense'.
Was is a linking verb. It does not have a homonym.
The homonym for 'suite' is 'sweet'.
The homonym for chord is cord.
The homonym for "vale" is "veil."
The homonym of sauce is "source".