Daily word games to challenge your mind
A curated list of 9-letter words tailored to this exact pattern. Endings like IUM often mark word families—helpful to confirm tense or morphology. For example: aluminium, americium, anthodium.
| Word | Definition | Length | Syllables |
|---|---|---|---|
| aluminium | 9 | 4 | |
| americium | 9 | 4 | |
| anthodium | 9 | 3 | |
| anthurium | 9 | 3 | |
| bacterium | 9 | 3 | |
| berkelium | 9 | 3 | |
| beryllium | 9 | 3 | |
| bronchium | 9 | 2 | |
| caldarium | 9 | 3 | |
| calvarium | 9 | 3 | |
| coccidium | 9 | 3 | |
| collegium | 9 | 3 | |
| colluvium | 9 | 3 | |
| collyrium | 9 | 3 | |
| columbium | 9 | 3 | |
| contagium | 9 | 3 | |
| criterium | 9 | 3 | |
| ctenidium | 9 | 3 | |
| cymbidium | 9 | 3 | |
| decennium | 9 | 3 | |
| dentalium | 9 | 3 | |
| deuterium | 9 | 3 | |
| diazonium | 9 | 3 | |
| dichasium | 9 | 3 | |
| effluvium | 9 | 3 | |
| epicedium | 9 | 4 | |
| epimysium | 9 | 4 | |
| euphonium | 9 | 3 | |
| gelsemium | 9 | 3 | |
| germanium | 9 | 3 | |
| gymnasium | 9 | 3 | |
| gynaecium | 9 | 3 | |
| gynoecium | 9 | 3 | |
| harmonium | 9 | 3 | |
| herbarium | 9 | 3 | |
| hospitium | 9 | 3 | |
| hydronium | 9 | 3 | |
| magnesium | 9 | 3 | |
| manubrium | 9 | 3 | |
| marsupium | 9 | 3 | |
| mazaedium | 9 | 3 | |
| neodymium | 9 | 3 | |
| neptunium | 9 | 3 | |
| palladium | 9 | 3 | |
| plutonium | 9 | 3 | |
| pollinium | 9 | 3 | |
| potassium | 9 | 3 | |
| presidium | 9 | 3 | |
| pterygium | 9 | 3 | |
| pycnidium | 9 | 3 | |
| reptilium | 9 | 3 | |
| rhizobium | 9 | 3 | |
| ruthenium | 9 | 3 | |
| sacrarium | 9 | 3 | |
| sensorium | 9 | 3 | |
| septarium | 9 | 3 | |
| strontium | 9 | 2 | |
| sulfonium | 9 | 3 | |
| sympodium | 9 | 3 | |
| symposium | 9 | 3 | |
| syncytium | 9 | 3 | |
| tellurium | 9 | 3 | |
| terrarium | 9 | 3 | |
| trapezium | 9 | 3 | |
| triennium | 9 | 2 | |
| trifolium | 9 | 3 | |
| triforium | 9 | 3 | |
| uredinium | 9 | 4 | |
| uropygium | 9 | 4 | |
| vestigium | 9 | 3 | |
| ytterbium | 9 | 3 | |
| zirconium | 9 | 3 |
What’s typical about IUM-ending words?
IUM often marks suffix families; think about derivatives when guessing.
Do you include UK/US spellings?
Where they exist, both may appear.