"Language." Ignore the first two sentences, which are irrelevant to the question. The third sentence says, "There are three words in 'the English language.'" The first is "the"; the second is "English"; and the third is "language." Language is something we use every day.
Unfortunately, this puzzle is frequently asked of others by those who do not know the answer; as such, the wording of the puzzle is inadvertently altered in such a way that there is no correct answer. There are a couple other archaic words in English that end in "gry"; however, none of these are correct answers, because none of them are things we use every day. (Besides, then the puzzle would be a trivia question rather than a riddle.)