Elicit means to draw out. Illicit means illegal or not allowed. Elicit a response. Illicit trade. Diction as a set is in word choice.
Draw out versus forbidden
If a question or a method is pulling an answer from someone, use elicit. If the thing itself is against the rules, use illicit.
Ensure versus insure is another look-alike, in ensure versus insure. Allude versus elude is in allude versus elude. Grammar overall is in ACT grammar rules.
The bottom line
Draw out: elicit. Not allowed: illicit.
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