highflier

Short definition from Wiktionary

Noun

1. 1
   A person who or a type of aircraft that flies at high elevations.
2. 2
   An ambitious person, especially one who takes risks or has an extravagant lifestyle.
3. 3
   A vertical pole used in commercial fishing to locate the beginning and end of a long fishing line.
4. 4
   A glamorous stock that potentially offers high returns to investors.
5. 5
   A swingboat.
6. 6
   A writer of begging letters.
7. 7
   A type of phaeton carriage.