One Word Substitution

'Ignorant' means lacking knowledge, education, or awareness. This directly matches the definition 'One who lacks knowledge'. The other options don't match: Fate (destiny), Drawn (sketched), Illegal (unlawful).

'Inaccessible' literally breaks down as 'in-accessible' meaning 'not accessible' - unable to be reached or approached. This perfectly matches the given definition.

'Mobocracy' combines 'mob' + 'cracy' (rule/government), meaning government by a mob or rule by the chaotic masses. The suffix '-cracy' means power or rule (as in democracy, bureaucracy).

A 'parasite' is an organism or person that lives on or in another and benefits at the other's expense. This biological term applies metaphorically to people who live off others.

A 'widow' is a woman whose spouse has died. The answer is correct despite the grammatical error in the question ('women' should be 'woman').

A 'veteran' is a person who has had long experience or skill in a particular field, especially in military service. 'Well experienced' directly matches this definition.

A 'sadist' derives pleasure or gratification from inflicting pain, suffering, or humiliation on others. This psychological/behavioral term perfectly matches the given definition.

The correct answer is D (None of these) because none of the given options correctly describes 'a person who loves everybody'. A cynic is someone who distrusts human motives, a fuselage is an aircraft component, and a theist is someone who believes in God. The actual term would be 'philanthropist' or 'humanitarian' but these aren't listed.

Somnambulism is the condition of sleep in which motor acts (as walking) are performed. 

The correct answer is B (Dermatologists) because a dermatologist is a medical specialist who studies and treats skin diseases. 'Edible' means something that can be eaten, 'stale' refers to old food, and 'old' simply means aged. The description directly matches the medical specialty.

The correct answer is C (Autocracy) because autocracy is a system of government where one person holds absolute power. 'Monogamy' means being married to only one person, 'synonyms' are words with similar meanings, and 'old' means aged. The definition clearly describes autocratic rule.

The correct answer is A (Incorrigible) because incorrigible means 'incapable of being corrected or reformed'. 'Silent' means quiet, 'mortal' means subject to death, and 'none of these' would be incorrect since incorrigible is listed and correct. The word directly matches the definition.

Archaeologist is skilled in the science of antiquities. 

The correct answer is C (Mercenary) because a mercenary is a soldier who fights for pay rather than for a cause or loyalty. 'Careless' means without proper attention, 'nihilist' rejects moral principles, and 'none of these' is incorrect. The definition precisely describes a mercenary soldier.

The correct answer is B (Pacifist) because a pacifist is someone who believes in and advocates for peace, opposing war and violence. 'Suicide' means self-killing, 'delete' means remove, and 'fool' means a foolish person. The term directly matches someone favoring peace.

The correct answer is C (Aquarium) because an aquarium is a transparent tank or container specifically designed for keeping fish and water plants. 'Zoo' is for land animals, 'house' is a general dwelling, and 'none of these' is incorrect. The definition matches aquarium exactly.

The correct answer is C (Infanticide) because infanticide specifically means the killing of infants. 'Rider' is someone who rides, 'bigot' is intolerant of others' views, and 'biped' is a two-legged creature. The term directly matches the definition given.

The correct answer is A (Obdurate) because obdurate means 'stubbornly persistent in wrongdoing' or 'hardened against feeling pity or sympathy'. 'Sceptic' doubts claims, 'illiterate' can't read, and 'scholar' is educated. The definition matches obdurate perfectly.

The correct answer is A (Bibliophile) because a bibliophile is someone who loves or admires books. 'Fanatic' shows excessive zeal, 'philosopher' studies fundamental questions, and 'living' means alive. The term combines Greek 'biblio' (books) and 'phile' (lover).

The correct answer is C (Omnivorous) because omnivorous means 'eating all kinds of food' - both plants and animals. 'Carnivorous' means meat-eating only, 'vegetarian' means plant-eating only, and 'none of these' is wrong. The prefix 'omni-' means 'all'.

The correct answer is B (Fatal) because fatal means 'causing death' or 'deadly'. 'Widow' is a woman whose spouse died, 'feet' are body parts, and 'fool' means a foolish person. The definition 'a disease or accident which ends in death' directly matches fatal.

A jurist is a person who is an expert, scholar, or student of law. The term specifically refers to someone well-versed in legal knowledge and practice, making it the precise one-word substitute for the given phrase.

Illiterate means unable to read or write. This is the direct definition of the phrase, making it the correct one-word substitute. Literate (option B) has the opposite meaning.

Garrulous means excessively talkative or tending to talk a lot. This perfectly matches the description of someone who talks too much. Passable means adequate, genius means exceptional intelligence, and stoic means unemotional.

A pessimist is someone who habitually sees or expects the worst outcomes - they focus on the negative or dark side of situations. An atheist denies God's existence, and neither fool nor None of these captures the specific mindset described.