[dragonwriter]

> In Greek it's not speaking with big words ("exacerbate" vs. "make worse") but how many old Greek words one uses

To be fair, in English it's not really “big words”, either, it's also old (but not particularly English; Greek, Latin, and French are pretty high on the list.)

Exacerbation (from which exacerbate is a back formation) is a fairly direct import from Latin. Defenestration was from (IIRC, at the time—and this was 400 years ago—already archaic) French. sic, which is definitely not a big word, is often perceived this way, again a Latin import. &c.