On Blossom you are able to add additional leave types and edit pre existing leave types. However, please note you are unable to edit holiday and sick leave.
How do I add leave types?
More > Settings > Leave Types > Add Leave Types
How do I edit leave types?
More > Settings > Leave Types > Click the edit pencil on specific leave type > Edit leave type name > Save.
Remember! Editing the leave type name will update all past leave entries of this type.