1. One who undoes; one who reverses what has been done; one who ruins.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• undow,
• yndoer,
• hndoer,
• jndoer,
• indoer,
• 8ndoer,
• 7ndoer,
• ubdoer,
• umdoer,
• ujdoer,
• uhdoer,
• unsoer,
• undower,
• undor,
• undoe,
• undore,
• undour,
• undoar,
• andoer,
• unodr

• underseal,
• underwing,
• untoward,
• underhung,
• underhand,
• underhill,
• underpass,
• undergrad,
• untier,
• undersize,
• underpart,
• underived,
• undertow,
• unadorned,
• undermine,
• underfelt,
• underbid,
• underlay,
• undergo,
• underfur,
• underbody,
• underplay,
• underwood,
• underboss,
• underpin,
• undergird,
• under it,
• undertake,
• undertone,
• underrate,
• underage,
• underbred,
• undertide,
• underside,
• underdown,
• unuttered,
• undercut,
• undergrow,
• undersea,
• undersell,
• under,
• underpay,
• underwear,
• undersoil,
• underfoot,
• underling,
• undersign,
• underline,
• underdone,
• underarm,
• underfed,
• underdog,
• undercoat,
• underway,
• under way,
• underlie,
• Underdahl,
• undershot,
• underact.

The adjective form of the word "undoer" is "undoing".

The plural of the "undoer" can be the "undoers".

The singular of the "undoer" can be the "undoer".