[A_D_E_P_T]

"Investment" --> "Capital"

Check. That worked.

"Capital" --> "Letter"

Did not work at all. And yet the two words are side-by-side with extreme frequency.

So, basically, I don't know how this game gauges relatedness. I do know that I don't like it.

[dangond]

Semantic similarity means similarity of meaning, not how frequently they appear together.

Try out semantle to get a better sense of it if it's not immediately intuitive what I mean by that.