suggestion-an idea,plan,or possibility that someone mentions,or the act of mentioning it.
意见,建议,提议,指为了改进或解决某一问题而提出建议,办法等.
advice-an opinion you give someone about what they should do.
忠告,意见,可指具有较知识,经验,判断力的人对另一个人的"劝告"或"见解".