A list of 10 words by biocon.
- indispensable appears on 18 other lists
- essential appears on 29 other lists
- de rigueur appears on 33 other lists
- obligatory appears on 36 other lists
- compulsatory appears on 1 other list
- requisite appears on 41 other lists
- prerequisite appears on 19 other lists
- necessary appears on 16 other lists
- imprescindible appears on just this list
- sine qua non appears on 58 other lists

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