Letters that make roughen
o, e, g, n, h, r, u are letters that make 'roughen'
roughens is a word created by adding a letter to 'roughen'
1 possible definitions for 'roughen'
Under this definition, roughen is a verb and has the following properties:
'roughen' can be a type of change surface.
"roughen the surfaces so they will stick to each other"