One Word Substitution

Assent means consent or agreement to something. Arrant means complete or thorough, errant means straying or wandering, and ascent means the act of rising - only assent matches the meaning of consent.

Aye is an archaic or formal word meaning yes, often used in voting or nautical contexts. Ark refers to a vessel or shelter, arc is a curved line, and eye is the organ of sight - none mean yes.

Attendants refers to people who attend or are present at an event, gathering, or venue. Assistance means help, assistants are helpers, and attendance means the act of being present - but attendants specifically means those who attend.

It is a narrow tool for boring holes in wood etc.  

Aught is an archaic or poetic word meaning anything or everything. Ought implies obligation, augur means to predict or foretell, and auger is a tool for boring holes - only aught matches the meaning.

An oracle is a prophet or someone who can predict the future, often through divine inspiration. Auricle is part of the heart or ear, while errant and arrant are adjectives meaning wandering or thorough respectively.

 "Auricle": is correct because the root is "aur" which means ear.

An awl is a small pointed tool used for piercing holes in leather or wood. Owl is a bird, all means everything, and aune is an old French unit of measurement - only awl is a tool.

Owl is a bird of prey known for its nocturnal habits and distinctive hoot. Awl is a tool, all means everything, and aune is a measurement unit - only owl is a bird.

An ark is a chest or box used to store valuable items. Arc refers to a curved shape, aye means yes, and eye is the organ of sight.

Errant means wandering or straying from the proper course. Arrant means thorough or downright, ascent refers to climbing up, and assent means agreement.

Bait is food used to allure or attract prey. Bale means a bundle, bate means to lessen or abate, and bade is the past tense of bid.

Bate means to lessen or reduce, from the word abate. Bait means to lure, bale means a bundle, and bade is the past tense of bid.