Curate, connect, and discover
Lae'zel is pretty fluent in Common but since she still sometimes messes up some words, I don't believe she understands a third of all the big words Gale uses casually. My headcanon is that she memorizes them during the day and then goes to demand elaborations in the evening, and Gale is very happy to have someone to teach linguistics to.
By the end of the game she can call Vlaakith an pernicious, diminutive old fuck, cut to Gale in her corner wiping away a tear of pride