1. etiología   economics   etiology, aetiology   accountancy   sociology   Hint Half-n-half Clue   2. ornitología   economics   rheology   choreography   ornithology   Half-n-half Clue   3. cosmetología   topology   anthropology   ornithology   cosmetology   Half-n-half Clue   4. aeronáutica   etiology, aetiology   aeronautics   seismology   ornithology   Half-n-half Clue   5. económico   archeology, archaeology   telegraphy   economics   sociology   Half-n-half Clue   6. radiología   sociology   radiology   etiology, aetiology   rheology   Half-n-half Clue   7. sismología   radiology   archeology, archaeology   seismology   choreography   Half-n-half Clue