The word "umbrell" is not included in the database, but Verbix uses automation to display the inflected forms.
Noun: umbrell
Sg.
umbrell
Pl.
umbrellles
Genitive
Dative
Sample Sentences
Than dressed hym Sir Bors unto a sterne knyght and smote hym on the umbrell, that his neck braste. [1470–1485 (date produced), Thomas Malory, “Capitulum xj”, in [Le Morte Darthur], book V, [London: […] by William Caxton], published 31 July 1485, →OCLC; republished as H[einrich] Oskar Sommer, editor, Le Morte Darthur […], London: David Nutt, […], 1889, →OCLC:]