Description Sight words, or high frequency words, are words that appear repeatedly in your children's reading material. Knowing these words "by sight" is essential for reading speed and comprehension. Consistent short vowels and simple stories mean children sound out (decode) most of the story, and must memorize only three sight words per book. Your child will continue to build confidence and sight word fluency, with Bob Books Sight Words - First Grade. These ten books provide 30 more sight words, in slightly longer stories, to build confidence and success in the progressing reader.