Approval Tasks: Reassign vs Delegate vs Route Task vs Add assignee

Summary:

Hi Team,

Just trying to understand the difference among the tasks of : "Reassign" vs "Delegate" vs "Route Task" vs "Add assignee"

Content (please ensure you mask any confidential information):

My Understanding is as below:

Reassign: If original approver reassigns an approval task, the hierarchy of new approver will be considered in the workflow.
Delegate: If original approver delegates an approval task, only the current approval is delegated and hierarchy of original approver is retained
Route Task: Works similar to Delegate; it adds a new approver ad-hoc after the current approver and hierarchy of original approver is retained.
Add Assignee: As I understand; this also works for adding adhoc approver.