| reason(expression, base, structure, foundation, basis) |
| recollection(noun, memory, remembrance, keepsake) |
| relic(noun, memory, remembrance, recollection, keepsake) |
| reminder(noun, memory, remembrance, recollection, keepsake) |
| restrictive(adjective, feature, characteristic, detail) |
| sense(noun, understanding, perception, awareness, discernment) |
| sixth sense(expression, power, sense, perception) |
| understanding(noun, perception, awareness, discernment) |
| acumen(noun, understanding, perception, awareness, discernment) |
| awareness(noun, understanding, perception, discernment) |
| demanding(adjective, feature, characteristic, detail) |
| discerning(adjective, feature, characteristic, detail) |
| discriminating(adjective, feature, characteristic, detail) |
| discriminative(adjective, feature, characteristic, detail) |
| foundation(expression, base, structure, basis) |
| ground(expression, base, structure, foundation, basis) |
| memory(noun, remembrance, recollection, keepsake) |
| particular(adjective, feature, characteristic, detail) |
| perspicacity(noun, understanding, perception, awareness, discernment) |
| principle(expression, base, structure, foundation, basis) |