Something can be 'cold' as in the physical temperature, and having a 'cold' is also a term for a viral infection.
cool
A homonym is a word that is spelled differently from another word, but is pronounced the same. A homonym for chilly is chili. Chilly means cool, and chili is a spicy dish.
The answer is which, but you mean homophone, not homonym.
The homonym of "drenched" is "drentched."
sore She's home sick today with a cold and a sore throat.
Hour is a homonym for our.
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".