Alternative names

[Idered]

selector - or
sequence - and
condition - if
action - do

useTree - useBehavior as suggested in HN comment

Selector, sequence is typical naming for behavior trees but might be a little hard to understand for beginners.

[crapthings]

what is a fallback node or priority node?
are they the same as a selector?

update

fallback node
This family of nodes are known as "Selector" or "Priority" in other frameworks.
Their purpose is to try different strategies, until we find one that "works".