| 100% | ENCEPHALON | 10 | Part of the central nervous system |
| 94% | SPINAL | 6 | __ cord, vital part of the central nervous system |
| 93% | RETINA | 6 | Only externally visible part of the central nervous system |
| 63% | SCIATIC | 7 | — nerve, that part of the nervous system beginning in the lower back and extending down the thigh |
| 61% | VENOUS | 6 | Like part of the circulatory system |
| 61% | KATAKANA | 8 | Part of the Japanese writing system |
| 60% | NOSE | 4 | Part of the olfactory system |
| 60% | GLAND | 5 | Part of the endocrine system |
| 60% | NODE | 4 | Part of the lymphatic system |
| 60% | ADENOIDS | 8 | Part of the lymphatic system |
| 60% | SPLEEN | 6 | Part of the lymphatic system |
| 60% | EAR | 3 | Part of the auditory system |
| 60% | SMALLINTESTINE | 14 | Part of the digestive system |
| 59% | GITRACT | 7 | Part of the digestive system, in brief |
| 59% | GLAND | 5 | Part of the body's endocrine system |
| 59% | VEINS | 5 | Parts of the body's circulation system |
| 58% | STOMACH | 7 | Part of the digestive system after the esophagus |
| 58% | OVARY | 5 | Part of the reproductive system that produces eggs |
| 58% | NEUROLOGY | 9 | Medical study of the nervous system |
| 57% | FOVEA | 5 | Part of the eye responsible for sharp central vision |
| 57% | NAVE | 4 | Central part of the church |
| 56% | INTESTINE | 9 | Large or small part of the digestive system |
| 56% | BLADDER | 7 | Muscular organ that is part of the urinary system |
| 56% | BOWEL | 5 | Lower part of the digestive system (rhymes with "towel") |
| 55% | NAVE | 4 | Central part of the church (anagram of "Evan") |
| 55% | NUCLEUS | 7 | The central and most important part of something |
| 55% | NEUROLOGY | 9 | The study of the nervous system |
| 54% | LOCKJAW | 7 | Bacterial infection of the nervous system; tetanus |
| 54% | INTESTINE | 9 | The tubular part of the digestive system |
| 53% | AMES | 4 | City in the central part of 39-Down |