Read, translate and remember.
act − act$\textbf{or}$
football − football$\textbf{er}$
produce − produc$\textbf{er}$
sing − sing$\textbf{er}$
write − writ$\textbf{er}$
manage − manag$\textbf{er}$
work − work$\textbf{er}$
art − art$\textbf{ist}$
chemistry − chem$\textbf{ist}$
piano − pian$\textbf{ist}$
science − scient$\textbf{ist}$
music − music$\textbf{ian}$
politics − politic$\textbf{ian}$
architecture − archit$\textbf{ect}$
‘word + man’
business − business$\textbf{man}$
police − police$\textbf{man}$
show − show$\textbf{man}$
sport − sports$\textbf{man}$