| Grammatiktheorie | grammar |
| Grammatiker | grammarian |
| Grammatologie | grammatology |
| Graphentheorie | graph theory |
| Dramatikerin | dramatist |
| Dramentheorie | dramatic theory |
| Stammbaumtheorie | tree model |
| Automatentheorie | automata theory |
| Musiktheorie | music theory |
| Staatstheorie | theory of the state |
| Grammatik | grammar |
| Grammatikalität | grammaticality |
| grammatikalisch | grammatical |
| grammatisch | grammatical grammatic |
| Dramatiker | dramatist playwright dramaturg dramaturge |
| Erkenntnistheorie | epistemology |
| Gruppentheorie | group theory |
| Quantentheorie | quantum theory |
| Urknalltheorie | Big Bang Theory |
| Grafikerin | graphic designer |