Following are the most widely used admin roles in Office 365 with their description.

Role Description
Global administrator It is by default a user who signs up to buy 0365 services. The global administrator can access all administrative features and It is the only user who assigns admin roles to other users.
Billing administrator Billing administrator makes organization purchases, manages subscriptions and support tickets, and monitors service health.
Exchange administrator Exchange administrator manages mailboxes and anti-spam policies for your business.
SharePoint administrator SharePoint administrator manages the document storage in SharePoint Online. They can also designate another user as site collection administrator.
Password administrator Reset passwords for normal users, manages service requests, and monitors service health.
Skype for Business administrator Skype for Business administrator configures Skype for Business for the organization.
Compliance administrator Compliance administrator have access to Office 365 admin center, security and compliance center, exchange online admin center, and the Azure AD Admin Portal.
Service administrator Service administrator role has "view-only" permissions except he/she can open support tickets and reads them.
User management administrator User management administrator can reset the password for users (only users and not admin), monitors service health, adds and deletes user accounts, and manages service requests.

Reference

https://support.office.com/en-us/article/About-Office-365-admin-roles-da585eea-f576-4f55-a1e0-87090b6aaa9d

Admin Roles in Office 365

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