FOUR LETTER WORDS
Each answer has 4 letters, but 3 of those letters are vowels.
1. A currency
 Euro
2. A genus containing over 500 species of flowering succulent plants, some used in skin care products
 Aloe
3. A US state
 Ohio (or Iowa)
4. Instead
 Lieu
5. Goodbye
 Caio
6. The chief component of urine
 Urea
7. A larval form of crabs and certain other crustaceans, characterised by thoracic appendages used for swimming
 Zoea
8. A man who is the lover of a girl
 Beau
9. A US state (but not the one in Question 3!)
 Iowa (or Ohio)
10. 9th letter of the Greek alphabet
 Iota