Yep, that ought to be ‘vocabulary’ – but that’s how one of your pages puts it:
Lessons
Learn by reading and listening to lessons from the Library. All lessons are graded to your level. Look up and save your new vacabulary.
Might want to fix that.
Do not underestimate our fiendishly clever efforts at subliminal teaching tricks.
The Canadians are a notoriously sly and fiendish people, this is true… noted.