충분히 = sufficiently, amply, fully.
-(으)ㄹ 수 있다 = be able to (do), is possible/probable.
These words have broad usages.
-(으)ㄹ 수 있다 can mean an ability or possibility depending on the subject and the verb it is paired with.
Examples:
- 우리는 충분히 이길 수 있어 = We can surely/easily win. (ability)
- 내일은 비가 올 수도 있다 = It can/might rain tomorrow. (possibility)
- 충분히 오해할 수 있어요 = (You/They) can easily be mistaken = They may well misunderstand it = It is very possible that they might misunderstand it.