Synonyms of prerequisite

1 Syllable
ought, must
2 Syllables
vitals, right-hand, righthand, vital, needful
3 Syllables
important, expedient, required, essential, committal, needfulness, essentials, bottom-line, life-or-death
4 Syllables
stipulation, precondition, necessaries, necessity, necessities, requirement, requisite, bottomline, necessitous, stipulations, mandatory, preconditions, necessary, name-of-the-game, coal-and-ice
5 Syllables
desideratum, obligatory, pre-requisite, imperative, indispensable
6 Syllables
undeniability
7 Syllables
inevitability, inevitabilities, indispensability