建议 [jiàn yì]
1. (提建议) propose; suggest; advise; recommend,ect.
我建议再试一次。I suggest trying once more.
2. (提出的建议)proposal; suggestion; proposition; recommendation
我接受了他的建议。I accept his proposal
推荐 [tuī jiàn]
recommend; recommendation
推荐人员recommend persons
推荐航线 recommended routes
推荐书目 recommended books
推荐信[书] letter of recommendation
so basically 建议can be used as verb n noun; while 推荐is used more as verb. And the meaning is different^^