I have thought a lot about Back Formation lately.
Back Formation is a linguistic term which refers to the formation/creation of a new word by removing affixes, i.e., certain parts of the word. The resulting neologism is called a back-formation.
An example would be the verb 'opine' born out 'opinion.' And 'opine' is a bona fide verb. The following, however, are NOT.
"commentate" - commentary
"orientate" - orientation
"conversate" - conversation
And something from syntax:
"must have 'went' - must have gone
They annoy one. In an appetite-suppressing sort-of-way.