This is the 9950th most frequent German word.
open
The German word "open" does not exist. If you mean "offen," it means "open" in English.
The word 'offen' is used as an adjective to describe the state of the door being not closed.
Die Tür ist offen.
The door is open.
The word 'öffne' is used as a verb in the first person singular, indicating the act of opening the window.
Ich öffne das Fenster.
I open the window.
Here, 'offenes' is used in its adjective form to metaphorically describe someone's kind and welcoming nature.