This is good to know. My current picture book, which I'm really excited about, uses the words "verbs" and "nouns." My target age is 4-7. I'm hoping that my audience, even if not truly understanding what a verb or noun is, will at least have heard mention of the words. I think it's also an opportunity for the teacher or parent to open up a dialogue about what is a noun and what is a verb. What are some other verbs and nouns in the story we just read? That sort of thing.