substrative

central constitutional crucial elemental elementary essential indispensable integral intrinsic major necessary paramount principal radical significant structural theoretical underlying vital

bottom cardinal first key organic original primary prime primitive requisite supporting

axiological axiomatic basal bottom-line constitutive foundational grassroots meat-and-potatoes primordial rudimentary substratal sustaining underived

accessory auxiliary extrinsic inessential insignificant learned least lesser minor needless nonessential secondary trivial unimportant unnecessary

additional advanced extra subordinate