1. Soziologie   radiology   choreography   sociology   telegraphy   Hint Half-n-half Clue   2. Radiologie   etiology, aetiology   rheology   archeology, archaeology   radiology   Half-n-half Clue   3. Topologie   topology   radiology   aeronautics   economics   Half-n-half Clue   4. Ätiologie   etiology, aetiology   archeology, archaeology   radiology   telepathy   Half-n-half Clue   5. Rheologie   economics   sociology   rheology   choreography   Half-n-half Clue   6. Vogelkunde   sociology   seismology   telegraphy   ornithology   Half-n-half Clue   7. Seismologie   entomology   cosmetology   ornithology   seismology   Half-n-half Clue