Ah, I met this test a few months ago. Got 28400 then, not bad for a non-nativ speaker at all… but certainly understandable given that I've probably communicated more in English than Finnish since my late teens (ie. the last 10 years). As for Finnish, a little approximation: I've an official Modern Finnish wordlist in analysis that lists 94100 basic, derived, compound, and loanwords; I've forked a sublist of 39400 noncompound, not-100%-predictable derivativs (tho still including some highly productiv suffixes), in which I've noted about 500 words not known to me. (Might rise a bit from there, but the number's definitely in the triple digits.) Of course, the original list could easily be amended by another 100k rarer/dialectal/technical words… Word *roots* are rather fewer in Finnish than English, tho; the list contains probably around 5000 of them, and up to 130 lexemes may be based on the most productiv few. (OT, but for a taster, these can be as various as eg. √ete- "fore, forward" > _edistys_ "progress", _esine_ "object", _etuus_ "benefit", _etelä_ "south".) —J.