About prefix class

Ma’am apne hum sb ko samjhaya prefix “er” ke bare me. mera question ye tha ki kya hum “er” ko as a doer samjh skte h . jaise paly me “er” lga de to player mtlb khelne wala …aise…ye main socha to bs puchh liya

Nhi isme kuch exception bhi hote h