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Vocabulary keeps the words you look up while reading, each with its sentence, to go over later. You find the list in Tools, newest first; choose a word to look it up again. The last row, Export, saves them for flash card apps such as Anki. The list keeps the newest 2,000 words: beyond that, the oldest go, so export them first to keep them all.
Flash cards, also in Tools, quiz you with spaced repetition: after Show answer you rate each card Again, Hard, Good or Easy, and that decides when it comes back. Make decks with Edit with your phone: type cards, paste a list or bring an Anki deck.
In the settings, under Reading, Words looked up become cards puts each looked up word into the deck Looked up.