1. astrologie   seismology   rheology   cosmetology   astrology   Hint Half-n-half Clue   2. ornithologie   accountancy   ornithology   astrology   topology   Half-n-half Clue   3. radiologie   radiology   etiology, aetiology   anthropology   economics   Half-n-half Clue   4. rhéologie   economics   rheology   accountancy   entomology   Half-n-half Clue   5. sismologie   etiology, aetiology   seismology   aeronautics   rheology   Half-n-half Clue   6. chorégraphie   calligraphy   ornithology   choreography   etiology, aetiology   Half-n-half Clue   7. aéronautique   aeronautics   economics   entomology   radiology   Half-n-half Clue