beginner (someone who has recently begun learning something new) / (Internet slang) noob

candidate (a person who is running in an election or who is applying to a position for a job)

producer, manufacturer

Kyūjitai form of 学者: scholar

astronomer

Kyūjitai form of 読者 (“reader”)

challenger

enthusiast; fan; devotee; one who loves something

a hypocrite

administrator, manager