열쇠 vs 키: Which is more commonly used?
I recently learnt 열쇠 that means keys. But in some cases, 키 is also used.
Which is more common, or when is one more naturally used over the other?
out of 열쇠 and 키, what is more naturally spoken, or are they both equally used?
eg. 차 키
vs
차 열쇠