| Nektarium | floral nectary honey leaf nectary |
| Nektarine | nectarine |
| Insektarium | insectarium |
| Nektar | nectar |
| Sakmarium | Sakmarian |
| Bestiarium | bestiary |
| Herbarium | herbarium |
| Prekarium | precarium |
| Terrarium | terrarium |
| Bakterium | bacterium |
| Deuterium | deuterium |
| Natrium | sodium |
| Neptunium | neptunium |
| Direktorium | board of directors |
| Lektorin | lecturer |
| Refektorium | refectory |
| Vektorraum | vector space |
| Hektar | hectare |
| Plektrum | plectrum |
| Rektorin | headmistress |