①agreement 是協議，有的時候是比較被動的，比如離婚協議，兩國之間就什麽事達成的協議。an arrangement， a promise or a contract
②contract 是合同，規定雙方各有那些義務等，商業合同，雇傭合同等等。an official written agreement
③covenant 壹般是法律，和很正式的合約。a promise to sb， or a legal agreement， especially one to pay a regular amount of money to sb/sth
④treaty 兩國之間簽定的的優惠政策，條約等a formal agreement between two or more countries
⑤ deal : 協議；（尤指）交易。an agreement， especially in business， on particular conditions for buying or doing sth⑥compact 協定；協議；契約；合約(formal) a formal agreement between two or more people or countries
⑦ accord 協議；條約 a formal agreement between two organizations， countries， etc.