begun

take the first step or steps in carrying out an action;
have a beginning, in a temporal, spatial, or evaluative sense;
set in motion, cause to start;
begin to speak or say; he began
be the first item or point, constitute the beginning or start, come first in a series;
have a beginning, of a temporal event;
have a beginning characterized in some specified way;
begin an event that is implied and limited by the nature or inherent function of the direct object;
achieve or accomplish in the least degree, usually used in the negative;
begin to speak, understand, read, and write a language;
BEGUN past participle of begin

begun is a valid Scrabble (US) TWL word

begun is a valid Scrabble Word in Merriam-Webster MW Dictionary

begun is a valid Scrabble Word in International Collins CSW Dictionary

begun is a valid Words With Friends word