both sides, both parties

respect, esteem

have respect for

opinion / advice, a suggestion

to advise, to suggest / to admonish

needed, necessary

need, necessity

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

suggestion box

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)