Common Core Standards
Grade 2
Reading RL.2.4
Describe how words and phrases (e.g., regular beats, alliteration, rhymes, repeated lines) supply rhythm and meaning in a story, poem, or song.
The focus on vocabulary words for second grade is about the sound of words and how they can come together (through rhyming or alliteration) to pack more of a punch to a tale. After all, when something is repeated (be it a certain word or phrase or a sound), that means it's important, right?