TAΓAϴON seems to have a similar application, in that the word popularly connotes a perfect, transcendental principle, but also literally refers to that objects that create pleasurable feelings, or pleasure itself.
I'm not sure if I agree with the definition there.
Nicomachean Ethics starts out with:
“Every art and every investigation, and likewise every practical pursuit or undertaking, seems to aim at some good: hence it has been well said that the Good is That at which all things aim.”
This sets up the difference between “some/a good thing” ἀγαθοῦ and The Good Thing τἀγαθόν.