| palaeobiology(noun, biology, study, science) |
| paleobiology(noun, biology, study, science) |
| physiology(noun, biology, study, science) |
| phytology(noun, biology, study, science) |
| quadruped(noun, animal, creature, brute, beast) |
| race(noun, division, classification, category, bracket) |
| radiobiology(noun, biology, study, science) |
| rank(noun, division, classification, category, bracket) |
| ranks(noun, division, classification, category, bracket) |
| rubric(noun, division, classification, category, bracket) |
| section(noun, division, classification, category, bracket) |
| set(noun, division, classification, category, bracket) |
| sociobiology(noun, biology, study, science) |
| sort(noun, division, classification, category, bracket) |
| speciality(noun, division, classification, category, bracket) |
| specialty(noun, division, classification, category, bracket) |
| stock(noun, animal, creature, brute, beast) |
| subclass(noun, division, classification, category, bracket) |
| subdivision(noun, division, classification, category, bracket) |
| subgroup(noun, division, classification, category, bracket) |