A
Direct-
Director
Employ-
Employee / Employer
Farm-
Farmer
Instruct-
Instructor
Electric-
Electrician
Journal-
Journalist
Train-
Trainee / Trainer
Physic-
Physician / Physicist
Equal-
Equality
Invent-
Inventor / Invention
Act-
Actor / Action
Appear-
Appearance
Dark-
Darker / Darkness
Collect-
Collector / Collection
Wait-
Waiter / Waitress
Science
Scientist
Library
Librarian
Photography
Photographer
Active
Activity
Popular-
Popularity
Develop-
Development
Explain
Explanation
Advertise
Advertisement
Imagine
Imagination
Present
Presentation