mortarboard
Word family nounmortarmortarboard
College
mor·tar·board /ˈmɔːtəbɔːd $ ˈmɔːrtərbɔːrd/ noun [countableC] 
SECa black cap with a flat square top worn by members of some universities on formal occasions 学士帽，学位帽 →5 see picture at 见图 hat- codswallop
- co-educational
- coefficient
- coeliac
- coerce
- coercion
- coercive
- coeval
- coexist
- coexistence
- coffee
- coffee break
- coffee house
- coffee klatch
- coffer
- coffin
- cogency
- cogent
- cogently
- cognac
- cognate
- cognition
- cognitive
- cognitive dissonance
- cognizance
- 亲狎
- 亲王
- 亲生
- 亲疏
- 亲疏贵贱
- 亲痛仇快
- 亲眷
- 亲眼
- 亲眼所见
- 亲睦
- 亲睹
- 亲知
- 亲笔
- 亲等
- 亲缘
- 亲缘交配
- 亲者痛，仇者快
- 亲耳
- 亲聆
- 亲自
- 亲自出马
- 亲蔼
- 亲览
- 亲谊
- 亲贵