| Zelltheorie | cell theory |
| Wellentheorie | wave model wave theory |
| Zelterin | camper |
| Zelthering | tent peg |
| Sellerie | celery |
| hellhörig | not soundproof |
| Spieltheorie | game theory |
| Eichtheorie | gauge theory |
| M-Theorie | M-theory |
| Theorie | theory |
| Zahlentheorie | theory of numbers |
| Zelllinie | cell line |
| Zelluloid | celluloid |
| Zellbiologie | cell biology cytology |
| Zellkern | nucleus cell nucleus |
| Zellulose | cellulose |
| Zelter | palfrey |
| zellenförmig | cellular |
| Hellseherin | clairvoyant |
| Kellnerin | waitress |