bar

[sash2008]

Polysemy or homonymy?
bar
bar

[Raymott]

Polysemy or homonymy?
bar
bar

They are two instances of the same word.
You can't attribute polysemy or homonymy to a pair of words unless you have a context.
You've asked quite a few questions about these terms. Have you looked up a few definitions and understood them yet? What is your understanding of the terms?

[sash2008]

They are two instances of the same word.
You can't attribute polysemy or homonymy to a pair of words unless you have a context.
You've asked quite a few questions about these terms. Have you looked up a few definitions and understood them yet? What is your understanding of the terms?

I understand that polysemy is a word that has several meanings but are related like. However, homonymy is different unrelated meanings like can (verb) and can (noun).

My word bar is in the following:

a bar of chocolate
the bar ( a place where beverages are served)

[Raymott]

I understand that polysemy is a word that has several meanings but are related like. However, homonymy is different unrelated meanings like can (verb) and can (noun).

Excellent, so you understand the distinction. You should be able to apply it.
The words don't have to be different parts of speech (eg, noun and verb); they can also both be nouns, etc. and still be polysemous or homoymous.

My word bar is in the following:

a bar of chocolate
the bar ( a place where beverages are served)

In both cases, "bar" refers to something long and thin. There are many types of bar that have this meaning. A bar of gold; both of your examples, an iron bar, a bar and medal.
However, if I had to, I'd say that a beverage bar is different - in fact "bar" is a metonymy: part of the establishment is used as a name for the whole.
There is no correct answer. You have to decide if you think that "bar" in chocolate bar and public bar are using the same meaning of "bar".
My opinion:
Chocolate "bar" is polysemous to the "bar" (the long serving bench) in a public bar.