Dual. Like meaning 2, as in a dual-headset.
The homophone for duel is dual.
duel
duel
The answer is that there is no homophone for can, but can is a homonym.
Your is a homophone of you're. In some dialects, yore is another homophone.
the homophone for stationery is stationary
The homophone is dense.
The homophone is cell.
there is no homophone for length
stock homophone
Hour is a homophone for Our
The homophone is style