Return to Book List   Glossary   Choose a Letter | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |   List of words for Letter 'R' Click on    to hear the word and definition. Click on the picture to see a bigger picture. Some are animations. roots plant parts that take in water  This plant has many roots. rotates spins  Earth rotates on its axis. ruler measures how long, how tall, or how big around something is  You can use a ruler to measure things. Leave Glossary