Synonyms for Requirement:

adj.

objective (adjective)
desideratum.

n.

bylaw, reservation, civil law, element, qualification, Chapter 7, precondition, specification, desideratum, civil liberties, basis, terms, act, Chapter 11, bill, case law, civil rights, fundamental, provision. core, prepossession, essence, key, preoccupation, burning issue/question, obsession, priority, feature, staple, claim, requisition, call, stress, concern, engrossment, exaction, lack, pinch. claim (noun)
requisition, call.
cognition (noun)
demand.
command (noun)
mandate, act.
condition (noun)
precondition.
demand (noun)
necessity.
essential (noun)
essence.
exigency/exigence (noun)
constraint.
obligation (noun)
demand, mandate, compulsion, obligation, must, inexorability, need, constraint, necessity.
requirement (noun)
exaction, need, compulsion, engrossment, inevitability, demand, requisite, prerequisite, must, qualification, proviso, imperative, preoccupation, necessary, specification, essential, precondition, necessity, fundamental, provision, pinch, stress, terms, condition, desideratum, concern, stipulation, element, prepossession, obsession, lack, obligation, claim.

Other synonyms:

qualification, precondition. provision. demand
claim.
Other relevant words:
essential, desideratum, lack, call, qualification, stress, terms, provision, precondition, claim, specification, reservation, exaction, requisition, necessary, fundamental.