Examples of four letter compound words are:ontointoupon
rain
mist
the answer to your question is the word lamp it is four letters and is a compound so good luck with that information.
the compound word for rain is Britain
teem
teem
I think rainbow is a compound word because rain and bow is a word.
One word that fits this definition is mist.
rain+drop=raindrop
Yes the word rainstorm is a compound word. The words are rain and storm.
rainbowraincoatrainfallrainmakerrainshowerrainstormrainwaterrainware