| heart(noun, condition, basic, fundamental, necessity) |
| implantation(fundamental, shorts, undercarriage) |
| inculcation(fundamental, shorts, undercarriage) |
| integrant(fundamental, shorts, undercarriage) |
| lifeblood(fundamental, shorts, undercarriage) |
| must(noun, condition, essence, basic, necessity) |
| name of game(noun, expression, idiom, basic, fundamental) |
| necessity(noun, condition, essence, basic, fundamental) |
| need(fundamental, shorts, undercarriage) |
| nitty gritty(expression, fundamental, shorts, undercarriage) |
| no-frills(fundamental, shorts, undercarriage) |
| no frills(expression, fundamental, shorts, undercarriage) |
| nub(fundamental, shorts, undercarriage) |
| nubbin(fundamental, shorts, undercarriage) |
| part and parcel(noun, expression, idiom, condition, essence) |
| polestar(fundamental, shorts, undercarriage) |
| precondition(noun, condition, essence, basic, necessity) |
| prerequisite(noun, condition, essence, basic, necessity) |
| principium(fundamental, shorts, undercarriage) |
| requirement(noun, condition, essence, basic, necessity) |