Is there a preferred spelling for the word "leaderboard"? Should it be one word or two? It would seem that both are correct, but is either preferred?
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If I look up leaderboard as one word in OED, it returns a reference to leader board as two words, which I suppose says something about which they think is correct!
Searching the corpora yields 13 instances without a space in the British National Corpus (BNC) against nine with a space; and in the Corpus of Contemporary American English (COCA) it's 82 without versus 90 with. [I think; I'm not all that familiar with those tools]
I would say those results are inconclusive.
A board by any other name:
It's really no different than blackboard. Inevitably, "leaderboard" will become increasingly more formally accepted.
If in doubt:
If in doubt, I'd hyphenate the two words:
Purpose of one-word usage:
From the usage I've seen online, the advantage of the one-word variant is concision when used as a (or part of a) title.