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- impounds
- impoverish
- impoverished
- impoverisher
- impoverishes
- impoverishing
- impoverishment
- impoverishments
- impracticabilities
- impracticability
- impracticable
- impracticableness
- impracticablenesses
- impracticably
- impractical
- impracticalities
- impracticality
- impractically
- imprecation
- imprecations
- imprecatory
- imprecise
- imprecisely
- impreciseness
- imprecisenesses