| irregulär | anomalous |
| regulär | regular |
| erregbar | nervously |
| irreguläres Verb | irregular verb |
| Irrer | crazy |
| irreal | unreal unreally |
| Erreger | germ pathogen |
| Erregung | excitation |
| Regulus | Regulus |
| Regler | controller |
| Regur | regur |
| regelbar | adjustable |
| Singular | singular |
| singulär | singular unique rare |
| Kartular | cartulary |
| Zirkular | circular letter |
| orbikular | orbicular |
| Formular | form |
| Grossular | grossular |
| curricular | curricular |