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I used to use OneLook! It must have been about 17 years ago. Congratulations on such a long-running website.

where do you get the word lists from?

edit : never mind, found the list https://www.onelook.com/?d=all_&v=s&sort=&langdf=all

OneLook crawls and indexes the headwords from ~1000 online dictionaries and glossaries. When you do a wildcard search, it searches all of these lists at once. Clicking on one of the results will show you the sources. The sites range from small subject-specific glossaries with a few dozen words, to commercial dictionaries like Merriam-Webster and OED.

Do you see spikes in usage during large puzzlehunt events?

I haven't noticed that, although I do get feedback from the puzzle hunt community from time to time!