-ist (a person who)
-ist
A person who does, practises or studies something.
The scientist showed us how plants make food.
Scientist
A person who studies science.
Ananya wants to be a scientist at a space centre.
Cyclist
A person who rides a bicycle.
The cyclist wore a helmet on the busy road.
Remember: -ist often goes with -ism or a subject: art → artist, piano → pianist, science → scientist. Spell scientist with 'sci' like science.