Debatable vs Discussion - What's the difference?

As an adjective debatable

is controversial not fully proved, open to debate, sometimes used humorously.

conversation or debate concerning a particular topic.

(en adjective)

Controversial. Not fully proved, open to debate, sometimes used humorously.

Those data are debatable , no one has been able to replicate them.

It's debatable whether he is a stud.

Of a person, argumentative.

That debatable individual.

A fitting subject for debate.

The lack of bonuses isn't debatable.

* See also

(wikipedia discussion)

(en noun)

Conversation or debate concerning a particular topic.

There was then a long discussion of whether to capitalize words like "east".

This topic is not open to discussion .

Text giving further detail on a subject.

Under each heading, you will find a discussion section.