| 100% | TAXONOMY | 8 | Classification system of organisms in biology |
| 45% | ECOSYSTEM | 9 | Community of organisms in an environment |
| 44% | LOCUS | 5 | System of points, in math |
| 44% | SULTANATE | 9 | System of governance in Oman |
| 43% | ABO | 3 | Classification system used in some banks |
| 43% | AUTOBAHN | 8 | System of national highways in Germany |
| 43% | AUTOROUTE | 9 | System of national highways in France |
| 42% | YOGA | 4 | System of exercise that originated in India |
| 42% | PLUMBING | 8 | System of water pipes in a home |
| 42% | LEVERARCH | 9 | System of holding papers in a folder |
| 42% | CASTE | 5 | System of social division still present in India |
| 42% | MECHANISM | 9 | System of parts working together in an appliance |
| 41% | VARIANT | 7 | In biology, a subtype of a virus or disease |
| 41% | CURRENCY | 8 | System of money in use in a specific country |
| 41% | SKILIFT | 7 | System of seats and tow bars used in mountains |
| 41% | CORALREEF | 9 | A system of living organisms; a barrier |
| 41% | BASAL | 5 | Kind of cell in biology |
| 41% | GENES | 5 | Units of heredity in biology |
| 40% | APARTHEID | 9 | Old system of racial segregation in South Africa |
| 40% | INVIVO | 6 | Within a living organism, in biology |
| 39% | DIGESTIVE | 9 | System of organs for food in and out of a body |
| 39% | MECHANISM | 9 | A system of parts working together in a machine |
| 39% | GENE | 4 | Unit of heredity, in biology |
| 39% | ABO | 3 | Kind of system, in medicine |
| 39% | DEWEY | 5 | Melvil _, US librarian who founded a system of decimal classification |
| 38% | TAXONOMY | 8 | Branch of science about organism classification |
| 38% | ABO | 3 | Kind of system in a hospital |
| 38% | ELO | 3 | Kind of rating system in chess |
| 38% | ECOL | 4 | Branch of biology which studies any organism in relation to its environment: Abbr. |
| 37% | GITRACT | 7 | Part of the digestive system, in brief |