One of my favorite books, all about words - some real, taken out of context, and listed by categories, like: "Light Words" (lissom, sibilant, nimble...), "Names for Elephants" (Wilbur, Bendigo, Wendell Tubb, Deuteronomy...), etc. Other words are completely invented and defined such as "a GONGOZZLER is an idle person who is always stopping in the street and starting at a curious object like a TINGLE-AIREY." The illustrations by Ben Shahn are also wonderful. Great fun to read aloud, and likely to lead to imaginative family word play!
Pair this with Richard Wilbur's Opposites, More Opposites, and a Few Differences.