This puzzle is based off the What is a Word™, What is a Phrase™ and What is a Number™ series started by JLee.
If a word conforms to a certain rule, I call it a DID WORD™. If the rule fails in last step, I call it an AID WORD™. If the rule fails completely or is not applicable, I will call it a NORMAL WORD Use the following examples to find the rule:
DID WORD™ AID WORD™ NORMAL
box lux axe
paddy candy silly
fight christ ghost
mater laughter raptor
quelling cunning roaming
putter outer goiter
Here is the CSV:
DID WORD™,AID WORD™,NORMAL box,lux,axe paddy,candy,silly fight,christ,ghost mater,laughter,raptor quelling,cunning,roaming putter,outer,goiter
The puzzle relies on the series' inbuilt assumption, that each word can be tested for whether it is a DID WORD™ or AID WORD™ without relying on the other words.
These are not the only examples of DID WORDS™ and AID WORDS™, more can be found.
Here is the hint
DID is the abbreviation of Dissociative Identity Disorder.