In What's the Difference, the distinctions between similar words are explored. Words such as cemeteries and graveyards, cougars and pumas, oceans and seas are explained, as well as seltzer water and club soda, milk and buttermilk, buffalo and bison.

Words that we frequently use interchangeably often have subtle differences, and sometimes have significantly different meanings. This book provides a fun look into the array of words in the English language that have similar meanings.