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Road map or roadmap. One word or two?

In an up-to-date corpus of 20 varieties of English, roadmap is about twice as common as road map. In a corpus built in 2104, the two forms were even-stevens, just about, but by the time of a 2018 corpus the ratio was 3:1 in favour of roadmap. It’s a historical process that has happened repeatedly. When Jane Austen wrote any body she did not mean 'any old cadaver'; body in her sense meant 'person'.