| propriety(noun, regulation, order, test) |
| regimen(noun, regulation, order, test) |
| regulation(noun, rule, belief, statement) |
| rock bottom(expression, foundation, basic, stipulation) |
| rudiment(noun, support, action, base) |
| ruling(noun, regulation, order, test) |
| sine qua non(noun, expression, idiom, foundation) |
| source(noun, support, regulation, action) |
| statute(noun, regulation, order, rule) |
| test(noun, regulation, order, standard) |
| ABCs(foundation, basic, stipulation, tenet) |
| book(regulation, order, standard, decree) |
| chapter and verse(noun, expression, idiom, regulation) |
| coal and ice(noun, expression, idiom, foundation) |
| component(foundation, basic, stipulation, tenet) |
| constituent(foundation, basic, stipulation, tenet) |
| essential part(noun, expression, foundation, basic) |
| ethic(noun, rule, notion, fundamental) |
| factor(foundation, basic, stipulation, tenet) |
| form(noun, rule, notion, fundamental) |