A "system" is a set of formulas and procedures, so the answer choice closest in meaning to "system" is "method," a noun meaning procedure or techniques. Considering the other choices, "disorganization" is a noun and the antonym of "system"; it means a lack of organization. "Unit" is a noun meaning a single thing or person or a quantity by which something is measured, and "work" is noun meaning productive activity.

"Wealth" is a noun that means a large amount of money, or when referring to other things, plenty. That means that the answer choice closest in meaning to "wealth" is "abundance," which is a noun meaning a large quantity of something. Considering the other answer choices, none are close in meaning to "wealth": a "need" is a necessity, a "lack" is the absence of something; and a "portion" is a piece of a greater whole.

To have "flair" is to be suave and to have "style." The other incorrect answer choices mean the following: "outspokenness" is to be outgoing; "inventiveness" is creativity; and "gruffness" is having a harsh exterior.

An "omission" is a removal of something; for instance, omitting text from a paper means taking out those words. That means that "removal" is the correct answer. As for the other answer choices, none are close in meaning to "omission": "omniscient" means all-knowing; "revival" means the act of coming back to conscious life or a comeback in popularity; and "retention" means the act of keeping something in a given place.

"Morale" means self-confidence or self-esteem, so "confidence" is the correct answer. None of the other answer choices are close in meaning to "morale": "fortification" means a structure like a wall or building built for defensive purposes; "intuition" means an internal sense of something that one has without being informed about it; "approval" means acceptance or endorsement, and "support," when used as a noun, means publicly conveyed approval or something that is integral to the stability of something else.

An "analogy" can be a type of comparison drawn between two different things, often expressed in a proportion. For instance: "As the eye sees so does the ear hear." These are based upon a certain similarity. For example, the eye and the ear each have their own ways of sensing things—or at least that is implied in the analogy. Therefore, we can also speak of an "analogy" as being a type of similarity. For instance, you could say, "They eye has a certain analogy to the ear, in that they both are used in sensing." (Of course, there are more poetic uses of analogy than this.) The best option is "similarity." Do not be fooled into thinking "equivalence" is correct, for an analogy is precisely something that is not strictly equivalent.

An “alloy” is a mixture of metals and as such, it is closest in meaning to “hybrid,” which means mixture of two or more components. To provide further help, “aerial” means mid-air, in the air; a “homonym” is a word that sounds the same as another word but has a different spelling and meaning; an “antonym” is a word that means the opposite of another word. 

The prefix "ann-" means yearly and an “annuity” is a sum of money given out annually. It is most similar to “pension,” which means money saved for or paid during retirement on a fixed, usually yearly basis. To provide further help, “tax” is money people pay to the government so that it can function; a “tariff” is money charged by the government to ship goods into or out of the country; “expenditure” is money spent; "income” is money earned. 

If you are in "accord" with someone or something, it means you are in agreement with that person or thing.

An “accent” is a type of speaking distinct to a regional group of people or a mark placed over a vowel to indicate emphasis. However, when used as a verb, “accent” means emphasize the importance of something, so "highlight" is the correct answer. None of the other answer choices are close in meaning to "accent": a "mentor" is an advisor; a "niche" is a suitable role; "refute" means to prove that an argument or point is incorrect; and "dangle" means swing or be suspended in midair.