The homonym for "listen" is "listen." Homonyms have the same spelling and pronunciation but different meanings, which is not the case here.
consider
The answer is which, but you mean homophone, not homonym.
The homonym of "drenched" is "drentched."
A homonym for "grays" is "greys."
The homonym for 'census' is 'sense'.
Was is a linking verb. It does not have a homonym.
The answer is which, but you mean homophone, not homonym.
The homonym for "mourning" is "morning".
A homonym for "grays" is "greys."
The homonym for 'suite' is 'sweet'.
Was is a linking verb. It does not have a homonym.
The homonym for 'census' is 'sense'.
The homonym of sauce is "source".
The homonym for chord is cord.
The homonym for "vale" is "veil."
The homonym for 'build' is 'billed'.
A homonym for doe is dough.
The homonym is sell