Thanks for all your replies.
I did try to work from the roots of the word: intelligence coming from the present participle of inter- and legere perhaps denoting the present action of collecting/perceiving 'knowledge', while intellect, from the past participle of the same Latin term, perhaps referring more to the processing of that knowledge that follows its collection/perception... all in all it lead me into a big mental knot and, ultimately, to this board.
I would however have to disagree with jheem-based on gut feeling, I definitely would not name intellectual as the pejorative of the two.