Dissident (5)
'dissident' is the definition.
(I know that rebel is a type of nonconformist)
This is all the clue.
(Other definitions for rebel that I've seen before include "Dissident" , "Revolt, mutiny" , "One who opposes the powerful" , "Resist authority" , "Bolshy" .)
'dissident' is the definition.
(I know that heretic is a type of nonconformist)
This is the entire clue.
(Other definitions for heretic that I've seen before include "person with the wrong outlook" , "One with unorthodox opinions" , "Cheer it (anag.)" , "Misbeliever" , "One with unorthodox beliefs" .)