When does preaching become teaching – and vis-versa?

‘Preaching’ is variously defined as
– ‘the delivery of a sermon or religious address to an assembled group of people, typically in church.’ – Oxford Languages (Google’s English dictionary)
– ‘the giving of moral advice in a pompously self-righteous way.’ – Oxford Languages
– ‘to give unwanted advice, especially about moral matters, in a boring way’ – Cambridge Dictionary
– to exhort in an officious or tiresome manner’ Merriam-Webster

While definitions help with understanding many things, many important things that defy definition are all too obvious when we encounter them.