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- palm tree
- palmtree
- palm-trees
- palmtrees
- palomar, mount
- palomar,-mount
- palomar,mount
- palomino
- palominos
- palpabilities
- palpability
- palpable
- palpably
- palpate
- palpation
- palpations
- palpitate
- palpitated
- palpitates
- palpitating
- palpitations
- pals
- palship
- palsied
- palsies
- 冲水
- 冲沏
- 冲沙闸
- 冲泡
- 冲泻
- 冲洗
- 冲浪
- 冲浪板
- 冲浪运动
- 冲消
- 冲涌
- 冲淡
- 冲澡
- 冲激
- 冲犯
- 冲田
- 冲盹儿
- 冲盹(儿)
- 冲眼
- 冲破
- 冲积
- 冲积层
- 冲积扇
- 冲积物
- 冲程