A single cash flow present value
A single cash flow present value will be received at some point in the future and discounted one time.
An annuity is more than one future cash flow that is paid at certain intervals discounted by greater amounts as they go further into the future.
There are different tables that are used to calculate future cash flows and annuities. Hope this helps!
A “present value”
A present value represents the value of one or more cashflows at any point in time in the future (including now).
An annuity is typically a constant stream of periodic payments going on into the future (maturity dates will vary based on the type of annuity).
Also this stream of annuity payments will have a present value which you can calculate as long as you have a maturity date and a discount rate.