cause, caws

Cause or cause means the thing or person that produces an effect--
The label says this may cause drowsiness.
He imagines that philosophy has done away with cause and effect.

Cause may also mean an ideal or goal--
We'd like to donate these funds to a worthy cause.
 He spends his spare time working for the cause, which is what he calls environmental clean-up.

Cause may also mean the grounds for a legal action, or for some other human behavior requiring official justification of some kind--
This could be a cause for a lawsuit.
He was dismissed for cause, but he won't say what it was.

Caws or caws ( rhymes with cause ) is the third person singular ( he, she, it ) form of "caw", meaning, said of a crow, to cry or squawk loudly, or said of something or someone else, to make a noise like a crow--
A crow sits on the fence and caws every afternoon.
When our cat is hungry he caws like a crow.

Caws may also be the plural ( more than one ) of "caw", meaning the call or cry of a crow--
I hear the caws of a crow, but I don't see it.
His bark sounds like a crow's caws.

Now that you know that, you can say--
"When the crow caws, there must be a cause, but we don't know what it is."