One word substitute is Aeronaut. Aeronaut: a traveller in a hot-air balloon, airship, or other flying craft. Astronaut: a person who is trained to travel in a spacecraft. Aerobat: a person who performs aerobatics. Acrobat: an entertainer who performs spectacular gymnastic feats.
From One Word Substitution · English Language Competence Test
One knowing everything
Dungeon entered by trapdoor
Plain or self-evident truth
Murder of a brother
A school boy who cuts classes frequently is a
One who despises persons of lower social position
Clumsy or ill-bred fellow
A place of good climate for invalids