Wood Pigeon | Woodpigeon | Ring Dove

Columba Palumbas to give the true Latin name, identifies the bird referred to variously as the Wood Pigeon, Woodpigeon and occasionally as the Ring Dove. I had always written this birds name as Woodpigeon, but my spell checker tells me I am wrong to do so. It says I should write it as two words, namely Wood and Pigeon. I looked it up on Wikipedia, the online dictionary, and it too infers that I