No, the Accounting package only comprises accounting-related features. For example, if you need both accounting capabilities and time and expense tracking, you need to purchase two separate subscription packages for that.
The same applies to the Manager and Billing packages. For example, if you are a project manager, you will likely need to purchase both the Time & Expense subscription as well as the Manager one. There currently isn't a package that offers all subscriptions in one. Check Core Help for details.