You say "Flyship"
Freundschaft
A friendship can be a language when the two or more friends just "Know" what the other(s) are thinking of of about to say.... Finishing each other's sentences...
The language of friendship is how you behave; the language of friendship is how you treat people, not words or what they mean.
You may say 'odotte ne.' The informal language implies the closeness of the friendship without explicitly stating it.
Friendship: ДРУЖБАPronunciation: Druzhba (uas oo in moose; zh as s in measure).
Elizabeth Zapata has written: 'You say hola, I say hello' -- subject(s): Fiction, Friendship, Spanish language 'Puerto Rico'
Friendship in Finnish is "ystävyys".
Friendship translates to 'Vriendschap'
Friendship is vänskap in Swedish.
A language barrier.
Language is not key to friendship no. The key to friendship might be trust and understanding. If you can understand your friend and they understand you and you trust them and they trust you, your friendship will probably last. There are all sorts of other ideas of what the key to friendship is so don't just take my advice. You need to decide what you value in a friendship and decide what your key to friendship is.
Happy Friendship Day.