das Zinn
tin
A silvery-white, soft heavy metal classified as a chemical element (Sn), often used for alloys such as bronze or for soldering.
Dieser alte Bierkrug ist aus reinem Zinn gefertigt.
This old beer stein is made of pure tin.

tin / junk
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tin
A silvery-white, soft heavy metal classified as a chemical element (Sn), often used for alloys such as bronze or for soldering.
Dieser alte Bierkrug ist aus reinem Zinn gefertigt.
This old beer stein is made of pure tin.

You can recognize the meaning of 'Zinn' (tin/junk) from the context. If it is about metal, crafts, or chemistry, it refers to the element. In colloquial, often derogatory remarks about objects or talk, it means 'Plunder' (junk) or 'Unsinn' (nonsense).
Für das Löten in der Elektronik brauchen wir Zinn.
For soldering in electronics, we need tin.
In its main meaning as a metal, 'Zinn' (tin) is an uncountable noun. You cannot use it in the plural. Instead, you talk about objects made of tin, such as 'Zinnfiguren' (tin figures) or 'Zinngeschirr' (tin tableware).
Der alte Becher ist nicht aus Silber, sondern aus Zinn.
The old cup is not made of silver, but of tin.
The meaning 'Plunder' (junk) or 'Unsinn' (nonsense) is purely colloquial and has a negative tone. It is used to dismiss something as worthless or stupid.
Er redet den ganzen Abend nur Zinn.
He just talks nonsense all evening.
nonsense
'der Quatsch' and 'das Zinn' can both colloquially mean something derogatory, for example nonsensical talk or worthless junk. 'der Quatsch' is very normal for this and is often used when something sounds stupid, wrong, or pointless. 'das Zinn' actually has a different main meaning, namely a metal. The derogatory meaning for nonsense or junk is colloquial and much less common. If you want to speak clearly and naturally, 'Quatsch' is usually the better choice. 'Zinn' in this sense sounds more specialized and can easily be misunderstood.

Nach dem Gespräch nennt sie die alten Versprechen nur noch wertloses Zinn.
After the conversation, she now calls the old promises nothing but worthless junk.
Was soll denn der Quatsch mit den drei verschiedenen Passwörtern?
What's all this nonsense with the three different passwords?