* Conference: The root word is fer (meaning "to carry" or "to bring"). This is combined with the prefix con- (meaning "together") and the suffix -ence (which denotes a state or action). So, "conference" literally means "to bring together for discussion."
* Adhesive: The root word is adhere, which means "to stick to something." The suffix -ive indicates something that has the quality of sticking.
Let me know if you have any other words you'd like to explore!