"Remedy" means "treatment" or a cure for some illness or problem. "Compensation" means payment for services rendered. "Plague" means a widespread and contagious disease. "Summary" means a brief overview of the main points of something. "Fortitude" means strength or bravery.

"Zest" means "enthusiasm," energy, or fervor. "Lethargy" is an antonym of "zest"; it means tiredness and a state in which one lacks energy. "Rancidness" means the quality of being old and rotten. "Prudence" means carefulness or caution. "Limberness" means the quality of being flexible and bendable.

"Infamy" means well-known for bad deeds or "notoriety." A "hedonist" is a person who only seeks pleasure. "Flattery" means excessive praise and compliments. "Excursion" means a short outing or trip. "Domicile" means residence or home.

A "feat" is an act or deed that requires courage, skill, or strength. Similarly, the correct answer "achievement" is something that has been accomplished through effort. None of the other answers have similar meanings: a "collection" is a group of interesting things gathered by a person; "strength" is the ability to be physically forceful; a "profession" is a career; and "measurement" is the act of measuring something or the data gathered by measuring something.

A "correlation" is the relationship between two things that always change together. They are always connected, so "connection" is the correct answer. "Marriage" also describes a connection, but it refers to the socially official uniting of a couple. "Uncertainty" is doubt, "frustration" is annoyance, and a "statistic" is a number that conveys a piece of information.

"Tedium" is the state of being dull, so "monotony," which means lack of change or boring repetitiveness, is the correct answer. None of the other choices are similar in meaning to "tedium" or "montony": "discomfort" is an uncomfortable feeling, "instructions" are guidelines describing the use of something, "flotation" is the act of floating, and "mid-afternoon" is a time in the middle of the afternoon. 

A "jaunt" is a short journey taken for pleasure, and the correct answer "excursion" is a journey or adventure. The other choices are not similar to "jaunt" or "excursion": "angle" is the difference in direction of two intersecting lines, "pleasantry" is something said to be nice or polite, "curse" is an offensive, angry saying, and "support" is help or encouragement.

"Cynicism" means mistrust or doubt, specifically the belief that people always act in their own interests. "Skepticism" also means doubt, so "skepticism" is the correct answer. None of the other answer choices are close in meaning to "cynicism": "luxury" means comfort and wealth, "poison" means a substance that is harmful or deadly when ingested, "energy" means vitality or the ability to be active, and "attraction" refers to a force that draws one thing or person to another thing or person.

A "portent" is a sign or a warning that something is going to happen, which is also the definition of the correct answer, "omen." None of the other answer choices are close in meaning to "portent": a "thought" is an idea formed in the mind, a "doorway" is an entrance formed by a door, "cheer" is joy and happiness, and an "error" is a mistake.

"Vernacular" means the commonly spoken language of a particular people or place, so "language" is the correct answer. None of the other answers are close in meaning to "vernacular": “mystery” means anything that is kept secret or remains unexplained; “relaxation” means rest; “poison” means harmful substance; and “marking” means a characteristic pattern.