Synonyms
A synonym is the choice closest in meaning. Related is not enough. Hammer is not a synonym of tool. Fragile is not a synonym of durable.
Cover the choices and put the word in a job-site sentence. Then uncover the choices and pick the one that could replace the word without changing the sentence.
Watch the word most. Two choices can be in the neighborhood. The answer is the nearest one, not the fanciest one.
Worked example
HAZARDOUS most nearly means
Dangerous. Routine, tiny, and legal do not mean risky.