| Automatentheorie | automata theory |
| Autobatterie | car battery |
| Knotentheorie | knot theory |
| Quantentheorie | quantum theory |
| Tomatensorte | tomato cultivar |
| Grammatiktheorie | grammar |
| Dramentheorie | dramatic theory |
| Staatstheorie | theory of the state |
| Autoantikörper | autoantibody |
| Automatikgetriebe | automatic gearbox automatic transmission |
| automatisieren | automate automatise automatize |
| Atomantrieb | atomic propulsion nuclear propulsion |
| Atomenergie | atomic energy nuclear energy |
| Tomatenpüree | tomate paste tomato purée |
| Tomatensoße | tomato sauce |
| Antimaterie | antimatter |
| Informationstheorie | information theory |
| Kategorientheorie | category theory |
| Mengentheorie | set theory |
| Graphentheorie | graph theory |