Don't know the difference between a tree lopper and an Arborist?

https://blast-wiki.win/index.php?title=What_sets_a_Tree_Lopping_and_an_Arborist_apart

One of the most pressing needs after having a thunderstorm is to have the branches and leaves of the trees in a compound trimmed. Here a differentiation has to be produced between the Arborist and the tree lopper