| difficulty | (noun) an effort that is inconvenient | Synonyms: trouble |
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| (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficultness |
| faculty | (noun) one of the inherent cognitive or perceptual powers of the mind | Synonyms: mental faculty, module |
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| (noun) the body of teachers and administrators at a school | Synonyms: staff |
| faulty | (adjective) having a defect | Synonyms: defective |
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| (adjective) characterized by errors; not agreeing with a model or not following established rules | Synonyms: incorrect, wrong |