Letters that make sob
s, o, b are letters that make 'sob'
sobs is a word created by adding a letter to 'sob'
2 possible definitions for 'sob'
Under this definition, sob is a noun and has the following properties:
sobbing has the same meaning as sob
sob is a derivative of sob.
Under this definition, sob is a verb and has the following properties:
"He was sobbing inconsolably"