This dearly needs a "Don't know" or a "Skip" option.

Also, as others have said, mixing easy and difficult words would make the process less boring.

Some felt too easily guessable. Too many joke answers maybe?

Literally when I got to advanced and beyond just picking the longer and more complicated looking answer was the right one. I think this test is extremely flawed.

43000.. It says I am a person of few words, and albeit true, I actually thought I did well... Until to started doing some crazy words...

It told me to read the dictionary.

I was doing well until I got to grandmaster.

Then I was doing poorly in grandmaster, until I realize you can ace grandmaster by just picking the longest explanation every time.

this is a test for willingness to put up with the whole 100. It says something.

3 clicks per is what gives it away. and the little compliments. and that it's 100 questions

This is something that could be done for other languages, word lists are easy.

I’m not sure how you’d gauge what knowing each word would indicate.

Also adequate options, that sound plausible.

I got 98 words right and it estimated I know 82k words. That's less than half the quoted 170k number, so what would it have estimated at 99 or at 100?

I got too many Greek words which obviously I got them right( guess why). does this qualify me as someone good at English words and their meaning?

For anyone who wants to take a real scaled vocabulary test, you can't beat the one given with Johnson O'Connor's aptitude tests.