English word histories and English root words can help you to learn advanced English vocabulary- even beyond C2 level.
Let's say it directly: language mastery does not stop at C2 level.
I’m not the first to propose this idea, but especially for written texts we really need to add some new difficulty levels: D1 and D2, to describe academic texts that use a lot of smart-sounding words.
A good way to get started learning these words is by learning Greek, Latin and even Proto-Indo-European roots that are shared by a large number of words, many of which are very advanced (and make you sound smart and cool):

Words with root VOR: devour, voracious, carnivore, herbivore, omnivore, locavore
Words with root NOC: noise, annoy, noisome, obnoxious, nocebo
Words with root PLAC: please, pleasure, pleasant, placid
Words with root BR/ PR/ FR: burden, born, pregnant, embarrassed, freight, freighter, porter

Cover photo credit: Koreni-00 - Корень — Википедия (wikipedia.org)

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