requirement

noun 0.794

quality requirement

noun 0.792

functional load

noun 0.628

requisite

noun 0.614

functional

noun 0.591

functionality

noun 0.583

functional work

noun 0.581

specification

noun 0.577

prereq

noun 0.555

prerequisite

noun 0.535

functional dependency

noun 0.532

critical function

noun 0.531

requisition

noun 0.525

mandatory

noun 0.524

desideratum

noun 0.522

need

noun 0.519

must-have

noun 0.518

capability

noun 0.516

precondition

noun 0.508

constraint

noun 0.503

operative clause

noun 0.502

necessary room

noun 0.501