| 100% | DIOXIDES | 8 | Oxides with two atoms of oxygen |
| 57% | HYDROGEN | 8 | Two atoms of this plus an oxygen atom makes water |
| 48% | DOUBLEBOND | 10 | Molecular link with two pairs of electrons shared by two atoms |
| 43% | ISOTOPE | 7 | One of two or more atoms with the same atomic number that contain different numbers of neutrons |
| 42% | ENOL | 4 | Compound with two carbon atoms |
| 42% | MONOXIDES | 9 | There's just one atom of oxygen in these molecules |
| 41% | ARK | 3 | Ship with two of every animal |
| 41% | ARK | 3 | Boat with two of every animal |
| 41% | OZONE | 5 | Form of oxygen with a sharp odor |
| 41% | ZEDS | 4 | Fezziwig is spelled with two of them |
| 41% | NUS | 3 | Antigone is spelled with two of them |
| 40% | PROTONS | 7 | Oxygen atoms have eight of them |
| 40% | OCANADA | 7 | Anthem with two sets of lyrics |
| 40% | BIPLANE | 7 | Aircraft with two sets of wings |
| 40% | EMU | 3 | Bird with two sets of eyelids |
| 40% | BIPLANE | 7 | Aircraft with two pairs of wings |
| 40% | BIPLANE | 7 | Craft with two sets of wings |
| 40% | DNA | 3 | Molecule with two chains of nucleotides |
| 40% | MORAYS | 6 | Eels with two sets of jaws |
| 40% | SITAR | 5 | Instrument with two layers of strings |
| 40% | BIREME | 6 | Warship with two banks of oars |
| 39% | ISOTONE | 7 | Either of two species of atoms with the same number of neutrons and a different number of protons |
| 39% | ISOTOPE | 7 | 2 atoms of 1 element with different neutron count |
| 39% | TRIAMORY | 8 | Relationship with two other lovers, both of whom consent |
| 39% | WEDDING | 7 | The book Shirley ends with two of this ceremony |
| 39% | ISOTOPES | 8 | Atoms with the same number of protons |
| 39% | OZONE | 5 | Gas with three oxygen atoms |
| 39% | OZONE | 5 | Molecule of 3 oxygen atoms |
| 39% | SANDWICH | 8 | Two pieces of bread with a filling |
| 39% | BIPLANE | 7 | Aircraft with two sets of stacked wings |