Proximity

Here you go. Here is Ryan, one of the developers at Clever Goat explaining how to play.

Proximity uses a technology called word2vec to calculate the semantic distance between words. This allows us to determine how close your guess is to the secret word. The closer you get, the more accurate the proximity column will be.

We used the GoogleNews-vectors-negative300 dataset from late 2021.

We don't know why the data set doesn't include them. Perhaps they were just warping the scores of everything else, since they are used in so many different contexts? Your guess is as good as ours.

The data seems to be normalized to US spelling. Proximity tries to automatically Americanize your spelling (in the cases where only the American version is in the data set). Of course, they probably couldn't normalize some words, like 'biscuit', 'lift', or 'pants', so for those you're on your own.

Yes! While playing a game, if you scroll down, you have the option to get a hint, or give up. You'll get a word that is slightly better than your best guess.