The word "healthy" can be used to describe someone's state of physical well-being. It can also just mean "normal" or "enough." For example, you can say that someone has a "healthy appetite." This person has a normal appetite—instead of having one that is sickly and very small. Also, you could say, "He had a healthy suspicion about gambling." This means that the person has a reasonable and normal suspicion about gambling, which is a risk business after all!

"Majority" means more than 50%, or the group with the most members in a given vote or debate. It is the opposite of "minority," which therefore cannot be the correct answer. The right answer is "most," because "most" means more than half. Thus, majority and most are synonyms. While "majority" can sometimes be used as a noun, it can also be used as an adjective. ("The majority of the population" is an example of it being used as a noun, while "the majority vote" is an example of it being used as an adjective.)

"Majority" means more than 50%, or the group with the most members in a given vote or debate. It is the opposite of "minority," which therefore cannot be the correct answer. The right answer is "most," because "most" means more than half. Thus, majority and most are synonyms. While "majority" can sometimes be used as a noun, it can also be used as an adjective. ("The majority of the population" is an example of it being used as a noun, while "the majority vote" is an example of it being used as an adjective.)

Although "regards" has several meanings, one of them is almost interchangeable with "esteem," which means judgement or opinion.

Note that "estimation," a similar-sounding word, is completely unrelated.

Abroad most closely means overseas.  If someone travels or studies abroad, it means they go overseas to another country.

If someone has a hunch, it means they have an idea or feeling about a situation or something in particular.

"Rot" is a verb that means "decay or cause to decay by the action of bacteria and fungi; decompose." While something that is rotting might gross someone out, "gross out" does not mean the same thing as "rot," so it cannot be the correct answer. Because "decay" is the closest synonym to "rot" amongst the listed answer choices, "decay" is the correct answer.

"Wince" is a word that when used as a verb, means "give a slight involuntary grimace or withdrawing movement of the body in anticipation of pain or distress." "Flinch," a word that when used as a verb means "make a quick, nervous movement of the face or body as an instinctive reaction to surprise, fear or pain," is the answer choice closest in meaning to "wince," so "flinch" is the correct answer.

"Hoax" is a word that when used as a noun means "a humorous or malicious deception," and as a verb, "deceive with a hoax." So, "truth" cannot be the correct answer because "truth" is an antonym of "hoax." "Ruse," however, is a noun that means "an action intended to deceive someone; a trick." Because "ruse" is the answer choice closest in meaning to "hoax," "ruse" is the correct answer.

"Luster," when used as a noun, means "a gentle sheen or soft glow, especially that of a partly reflective surface," so we need to pick out an answer choice that is a noun and means something like "a gentle sheen." "Dullness" cannot be the correct answer, then, because "dullness" is an antonym of "sheen." "Shine," however, when used as a noun, means "a quality of brightness, especially from reflected light," and because "shine" is the answer choice closest in meaning to "luster," "shine" is the correct answer.