fir
Fur is a homonym for fir. Fir and fur are pronounced the same but have different meanings. Fir refers to a type of tree, while fur refers to the hair of animals.
The homonym of "course" could be "coarse," which means rough or uneven in texture.
The answer is which, but you mean homophone, not homonym.
The homonym of "drenched" is "drentched."
The homonym for 'suite' is 'sweet'.
The homonym for 'census' is 'sense'.
Was is a linking verb. It does not have a homonym.
The homonym for "mourning" is "morning".
A homonym for "grays" is "greys."
The homonym of sauce is "source".
The homonym for chord is cord.