der Ständer
stand
A device or frame used to keep an object upright or to set it down.
Stell das Fahrrad bitte in den Ständer, damit es nicht umfällt.
Please put the bicycle in the stand so it doesn't fall over.

stand / boner / post
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stand
A device or frame used to keep an object upright or to set it down.
Stell das Fahrrad bitte in den Ständer, damit es nicht umfällt.
Please put the bicycle in the stand so it doesn't fall over.

'Der Ständer' (the stand) is derived from the verb 'stehen' (to stand). It is a device that helps an object stand upright by itself.
Ohne den Ständer würde das Motorrad umkippen.
Without the stand, the motorcycle would tip over.
The meaning of the word only becomes clear from context. If people are talking about objects such as bicycles or sheet music, it means a stand. In the context of construction engineering, it is a post. In conversations about the human body, it has a sexual, vulgar meaning.
Der Notenständer ist zu niedrig eingestellt.
The music stand is set too low.
In its main meaning, 'Ständer' (stand) is often part of compound words that describe the purpose more precisely, e.g. 'Fahrradständer' (bicycle stand), 'Wäscheständer' (drying rack), 'Notenständer' (music stand), or 'Kleiderständer' (clothes rack).
Häng deine Jacke bitte auf den Kleiderständer.
Please hang your jacket on the clothes rack.
In the meaning 'Erektion' (erection), the word is vulgar and belongs to colloquial speech. It should absolutely be avoided in formal or polite conversations.
In der Umkleidekabine machten die Jungen darüber unanständige Witze.
In the changing room, the boys made indecent jokes about it.
The meaning 'senkrechter Pfosten' (vertical post) is technical language from construction, especially timber construction and carpentry. You will rarely hear this meaning in everyday life.
Für die Reparatur des Fachwerks benötigen wir neue Ständer aus Eichenholz.
For the repair of the half-timbered structure, we need new upright posts made of oak.
desire / buck
'der Bock' and 'der Ständer' can both be a kind of frame or stand. A 'Bock' usually supports something from below, often during work, for example a 'Sägebock' (sawhorse). A 'Ständer' is more likely to keep an object upright or provide a place to put it, for example a 'Fahrradständer' (bike stand) or 'Notenständer' (music stand). The words can be confused because both hold things. As a help: a 'Bock' often carries a work surface or a board, while a 'Ständer' holds something in a standing position.

Vor dem Haus steht ein Ständer für die Fahrräder.
There is a stand for the bicycles in front of the house.
Er hat das Holz auf einen Bock gelegt und dann gesägt.
He put the wood on a trestle and then sawed it.