Beneficiary /ˌben.əˈfɪʃ.i.er.i/ n. 受益人
meaning: a person or group who receives money, advantages, etc. as a result of something else.
1) 前缀:bene- 好处 (benefit)
2) 词根:fic- 做(fiction)
3) 后缀:-ary 名词后缀(dictionary)
e.g. Her husband was the chief beneficiary of her will. 她丈夫是她的遗嘱的主要受益人。