In Simpleton terms, knowledgeable is keeping/knowing a certain amount of knowledge, while intelligence is an ability.
Thank you for providing the definitions, as that reduces the length of my statement.
Knowledge can be held as the retention of gained knowledge through experience, practice, etc.... So that implies that the raw form of knowledgeable can be a person that reads tons of cook books and scores of science magazines without application. The person may not know how to implement jack shit from what he's read, but he surely can tell you verbatim what was inside of the book. In another scenario, an old man can tell you how the stock market works based off of his twenty year experience. "He is knowledgeable on the topic of stock markets and how it works because of his time spent in the stock markets, even though he didn't amount to anything". You do not say either of these two are intelligent as they do not prove any sort of novel idea; rather, it is preexisting knowledge that is being shown but not implemented.
On the flip side, intelligence is the ability to process a skill, formulate an idea, and reason one's situation, all separately. The raw form of intelligence, relative to the simply used term, would hold its place unto the earliest of mankind, the cavemen; they created stone knives, bows, arrows, fire pits, etc.... All through reasoning on how they could get from point A to point B, though they were not knowledgeable as they had attained no previous information. To use the previous examples, a person that read a cook book and constantly read science magazines, cooked from the cook book and added his own zing, and researched and developed upon the scientific readings, is a person that we can say, "Wow that guy is intelligent. He reworks some of those recipes and they turn out great. He also finds errors and faults while formulating his own hypothesis for scientific articles!" As for the old man, his intelligence could sparkle as he retired from being a successful stock trader, so we one would say, "Jesus, this guy is knowledgeable in the stock trade because of his twenty years of experience, and I remember that this guy knew exactly when the stocks were going to fall based off his equations, damn, he must be intelligent."
A knowledgeable person at the root is usually just knowledgeable and not necessarily intelligent, but an intelligent person usually associates his actions with being knowledgeable.
Knowledgeable= Memorized the unit circle coordinates (trig)
Intelligent= Uses just one right triangle to turn degrees into coordinates on the unit circle.
Knowledgeable= Works as the head of the human resources department because he does a great job in exactly what he's doing in his field, he gets the job done.
Intelligent= Works as the vice president of the whole company because he was very knowledgeable in his previous position, and he went beyond his work to achieve greater results for the company.
Knowledgeable= "I read about how solar panels work, I know everything about them, ask me ANYTHING, I can answer you."
Intelligent= "I read about solar panels, and I can answer any question, not to mention I just built my own solar powered laptop charger by putting together everything that I learned."
