Nouns

(n)imperial, imperial bearda small tufted beard worn by Emperor Napoleon III
(n)imperiala piece of luggage carried on top of a coach

Adjectives

(a)imperialrelating to or associated with an empire“imperial colony”, “the imperial gallon was standardized legally throughout the British Empire”
(a)imperialof or belonging to the British Imperial System of weights and measures
(a)imperialbefitting or belonging to an emperor or empress“imperial palace”
(s)imperial, majestic, purple, regal, royalbelonging to or befitting a supreme ruler“golden age of imperial splendor”, “purple tyrant”, “regal attire”, “treated with royal acclaim”, “the royal carriage of a stag's head”