A sail is a part of a ship that helps it move. Similarly, a propeller is a part of an aeroplane that aids in its movement. Other options do not show this direct part-to-function relationship.

Prenetic refers to an intense, passionate type of movement, often driven by strong beliefs or emotions. Similarly, fanatical refers to extreme devotion to a belief or cause. Both analogies show the relationship between an intense form of action or behavior (movement and belief) and the passionate or extreme version of it (prenetic and fanatical).

An audacious person is bold and daring, while trepidation refers to fear or anxiety. Similarly, a laconic person is concise and to the point, while volubility refers to excessive talkativeness. The analogy shows a contrast between a bold characteristic and its opposite (trepidation), and a concise characteristic versus its opposite (volubility).

To assuage means to ease or alleviate sorrow or emotional pain. Similarly, to dampen means to reduce or lessen ardor (enthusiasm or passion). The relationship is one of reduction or moderation: assuaging lessens sorrow, and dampening lessens ardor.

To embarrass someone means to cause them to feel self-conscious or uncomfortable, while to mortify someone means to cause extreme embarrassment or humiliation. Similarly, to indulge means to give in to a desire or want, and to mollycoddle means to overindulge or pamper someone excessively. Both analogies show a relationship between an action and its more extreme or intensified version: embarrassment becomes mortification, and indulgence becomes mollycoddling.

Pernicious means something that is harmful or destructive, and it can injure or cause damage. Similarly, disingenuous refers to something or someone that is not sincere, and it can mislead by providing false or deceptive impressions. Both analogies involve a harmful quality that leads to a detrimental action: pernicious leads to injury, and disingenuous leads to mislead.

Dogma refers to a set of established beliefs or doctrines, and an iconoclast is someone who challenges or rejects established beliefs. Similarly, a convention is an established practice or tradition, while a maverick is someone who does not conform to those conventions. The analogy shows the relationship between an established norm and someone who opposes it: dogma to iconoclast, and convention to maverick.

A suspicious person may be wary or doubtful, while a paranoid person experiences excessive, irrational fear or suspicion. Similarly, an admiring person has a positive feeling toward someone or something, while an idolatrous person has an extreme, almost worshipful devotion. Both analogies show a progression from a moderate to an extreme version of a characteristic: suspicious to paranoid, and admiring to idolatrous.

Vernacular refers to the common language spoken by people in a particular place or region. Similarly, jargon is specialized or technical language used within a specific profession. Both pairs describe the relationship between a form of language or expression and the context in which it is used: vernacular is tied to place, and jargon to profession.

Pertinent means directly related or relevant to the matter at hand, and relevance refers to the quality of being pertinent. Similarly, redundant refers to something that is unnecessary or superfluous, and superfluity refers to excess or something beyond what is needed. The analogy shows the relationship between an adjective and the noun that describes its quality: pertinent is linked to relevance, and redundant is linked to superfluity.