1. verb to noun: -ant

 

[[X]V ant]N

 

assist → assistant     consult → consultant     defend → defendant

 

2. noun to verb: -ify

 

[[X]Y ify]V     Y= N,A

 

terror → terrify     horror → horrify     solid → solidify

 

3. output words in (1) as the inputs in (2)

 

assistant → assistantify     consultant → consultantify     defendant → defendantify

 

These resulting words are not well formed and are not already-existing words. These words do not make sense because the output words already have the ending affix -ant. When you combine the affix -ant with another affix -ify, you get a word that does not already exist and does not sound right. In this process, the only way you can successfully change words from different categories is by starting out with a regular word that has no affixes added on to it. If you start out by using a word that already has an added affix, you get a result of a non-existing word.