Ok. Here it goes.
Creating words via "word-bushes" is creating words via abstraction and association. It's called a word-bush because the words are stemming from a root and branching from their parents in a bush-like fashion if we wish to draw their relations. It looks similar to the family-tree, oftentimes languages are imagined and portrayed as such, one language stemming from another.
Instead of taking a word, looking up it's translations to several languages, then hacking pieces from those words and stitching them together into monstrosities, this way we could "grow" words from each other.
The basis of this "growth" is the relations between the ideas of the things we want to name. Naming: creating a word for a thing - e.g. the name of "an angular object with empty space inside and what we use for storage" is "box".
This relation is based on the abstract properties of the things.