The language used in the Ethereum ecosystem doesn't always entirely align with the language used in the Bitcoin ecosystem.
All full nodes in the Bitcoin ecosystem verify all transactions and blocks from genesis. This is generally not the case in the Ethereum ecosystem as this exercise is much slower and requires significantly more disk operations (i.e. see ...
What am I missing?
What is the length of largest known reorganization in bitcoin?
There have been only two large re-orgs in Bitcoin's history. The first is the value overflow incident in August 2010 that caused a re-org of 53 blocks and the March 12, 2013 fork that caused a re-org of 24 blocks.
There may be a future need for a reorg of more than 6 blocks?