"Mature" is a synonym of "responsible."

"Revealed" is a synonym for "discovered." None of the other answer choices could qualify as a synonym for "discovered," and "missed" and "lost" could be considered antonyms of "discovered."  

"Compress" is a synonym of "squeeze."

“Fairness” is a noun that means “free from bias or injustice; evenhandedness,” so we need to pick out an answer choice that means something like “the state of being free from bias or injustice.” That means that “discrimination” cannot be the correct answer, because “discrimination” means “the unjust or prejudicial treatment of people or things,” making it an antonym, not a synonym, of “fairness.” “Justice,” however, is a noun that can mean “the quality of being fair and reasonable,” and because “justice” is the answer choice closest in meaning to “fairness,” “justice” is the correct answer.

“Unlucky” is an adjective that consists of the negative prefix “un-“ and “lucky,” so we can infer that it means “not lucky, so we need to pick out an answer choice that means something like “having to do with bad luck.” That means that “fortunate” cannot be the correct answer, because “fortunate” means “involving good luck; lucky,” making it an antonym, not a synonym, of “unlucky.” “Unfortunate,” however, is an adjective that we can infer means “not fortunate” because it consists of the negative prefix “un-“ and “fortunate.” This is indeed the case, as “unfortunate” means “having or marked by bad fortune; unlucky,” and because “unfortunate” is the answer choice closest in meaning to “unlucky,” “unfortunate” is the correct answer.

“Sleep” is a word that can be used as a noun or a verb, but because all of the potential answer choices can be used as verbs, we will need to consider “sleep” as a verb. When used as a verb, “sleep” means “rest by sleeping; be asleep,” so we need to pick out an answer choice that means something like “rest by sleeping.” That means that “awaken” cannot be the correct answer, because “awaken” means “cause to stop sleeping,” making it an antonym, not a synonym, of “sleep.” “Doze,” however, when used as a verb, means “sleep lightly,” and because “doze” is the answer choice closest in meaning to “sleep,” “doze” is the correct answer.

“Count” is a word that can be used as a noun or a verb, but because all of the potential answer choices are verbs, we will need to consider “count” as a verb. When used as a verb, “count” can mean “find the total number of something,” “take into account; include,” or “be significant.” So, we need to pick out an answer choice that means something like “find the total number of a collection,” “include,” or “be significant.” That means that “exclude” cannot be the correct answer, because “exclude” means “remove from consideration; rule out,” making it an antonym, not a synonym, of “count.” “Matter,” however, when used as a verb, means “important,” and because “matter” is the answer choice closest in meaning to “count,” “matter” is the correct answer.

“Hunch” is a word that can be used as a noun or a verb, but because all of the potential answer choices are nouns, we will need to consider “hunch” as a noun. When used as a noun, “hunch” means either “a feeling or a guess” or “something with a hump.” That means that “fact” cannot be the correct answer, because “fact” means “a thing that is indisputably the case,” and because a hunch is specifically “a guess,” “hunch” cannot be a synonym of “fact.” “Suspicion,” however, is a noun that can mean “a feeling that something is possible, likely, or true,” and because “suspicion” is the answer choice closest in meaning to “hunch,” “suspicion” is the correct answer.

“Realize” is a verb that means “become fully aware of something as a fact; understand clearly,” so we need to pick out an answer choice that means something like “become fully aware of something.” That means that “overlook” cannot be the correct answer, because “overlook” can mean “fail to notice something,” making it an antonym, not a synonym, of “realize.” “Comprehend,” however, is a verb that means “understand,” and because “comprehend” is the answer choice closest in meaning to “realize,” “comprehend” is the correct answer.

“Pinpoint” is a word that can be used as a noun, adjective, or verb, but because all of the answer choices can be used as verbs, we will need to consider “pinpoint” as a verb. When used as a verb, “pinpoint” can mean either “find out something with certainty” or “find the exact position of something,” so we need to pick out an answer choice that means something like “find out something for certain.” That means that “mistake” cannot be the correct answer, because “mistake,” when used as a verb, means either “be wrong about,” a meaning very distant from that of “pinpoint.” “Identify,” however, is a verb that can mean “know and say who someone is or what something is,” or “show who someone is or what something is,” and because “identify” is the answer choice closest in meaning to “pinpoint,” “identify” is the correct answer.