Where two different numbers sound the same.
Depending on how it is said 18 & 80 ( eighteen and eighty. )
Also 7(seven) & 11(eleven).
A lot depends on the local accent and the hearing acuteness of the the listener.
The homonym of forth is fourth, which refers to the ordinal number following third.
The homonym of "drenched" is "drentched."
The answer is which, but you mean homophone, not homonym.
Hour is a homonym for our.
The homonym for 'suite' is 'sweet'.
The homonym for 'census' is 'sense'.
Homonym for grays is graze
The homonym for "vale" is "veil."
The homonym for chord is cord.
Was is a linking verb. It does not have a homonym.
The homonym of sauce is "source".
The homonym for "mourning" is "morning".