Learning Spanish & Etymology Pattern-Matching for Nerds

Pluma, Spanish for “feather”, sounds nothing like the English feather.

But it is a cousin to the English fleece.

Both come from the same Indo-European root *pleus‑, which meant “feather” or to “pluck.”

But they sound so different! That is because the Indo-European p- sound stayed the same into Latin then Spanish, but changed into a f- in the Germanic branch (including English). 

Thus the p‑l of pluma maps to the f‑l of fleece.