Apparently the word rust is related to the word red, but not the word dust.

I thought Entomology was the study of treebeard and his friends

I often struggle to know who that fits with epistemology.

That would be an ecumenical matter

Maybe if it's a Firefly game tool...I did that there when GF9 stopped the full mats.

Oh, this is double hard, isn't it. My initial thought was that it was a confusion between paedology and pedology (in my head something to do with feet!). But it's actually soil science... TIL :)