A longstanding custom is called a Tradition
The word "longstanding" is an adjective.
A longstanding mutual animosity between two families is often referred to as a feud.
That would be the same as 'traditions'.
cultural diffusion
Most probably "Song creator" or "Create custom song"
Check out this guy on youtube called UgotHacked35000vr. He has a video on how to make custom tracks.
a fighter that wont lose
Suicide.
'Trick or Treat'
There is a printing company that prints custom vinyl designs and ships them to customers. The company is called Creative Banners and they will create a custom vinyl for you with the provided specifications and will ship it to you.
As an adjective it is one word "longstanding" (traditional, done for many years).
Supposedly longstanding Concussion issues.