可以参看英语解释理解近义词的分辨：
一、词汇辨析
association 协会，联盟，社团；联合；联想 【正式团体】
a formal organization of people or groups of people
committee n. 委员会
1. a special group delegated to consider some matter
a committee is a group that keeps minutes and loses hours
2. a self-constituted organization to promote something
institute
1. (促进科学、教育、艺术等的)组织；学会，学社；协会
2. (艺术、音乐、技术类的)学院；专科学院；研究院(或所）
an association organized to promote art or science or education
society 社会团体，协会，社团
1. an extended social group having a distinctive cultural and economic organization
2. a formal association of people with similar interests
they formed a small lunch society
二、用词已有固定表达
公司主打产品乐之洁消毒杀菌喷雾是【中国医师协会】“关爱健康行动”的指定产品。
Company main product music Sterilization cleaning spray is 【China Medical Association 】"Health care operations" of the designated products.
【美国胸科学会】建立于1905年，是世界领先的医学协会，它致力于促进肺、病危护理和睡眠医学发展。
Founded in 1905, 【the American Thoracic Society】 is the world's leading medical association dedicated to a dancing pulmonary, critical care and sleep medicine.
