1. telegrafía   sociology   rheology   aeronautics   telegraphy   Hint Half-n-half Clue   2. económico   economics   calligraphy   accountancy   aeronautics   Half-n-half Clue   3. sociología   seismology   theology   sociology   accountancy   Half-n-half Clue   4. etiología   sociology   radiology   etiology, aetiology   telegraphy   Half-n-half Clue   5. radiología   radiology   telepathy   calligraphy   ornithology   Half-n-half Clue   6. topología   topology   telepathy   seismology   anthropology   Half-n-half Clue   7. ornitología   topology   astrology   ornithology   accountancy   Half-n-half Clue