avg_neighbour_corr vs avg_combined_corr

I was wondering, what is the precise difference between avg_combined_corr and
avg_neighbour_corr? As far as I understand avg_neighbour_corr could for
example tell me what the average degree of the vertices neighbouring a
vertex of a given degree are. What in this context would avg_combined_corr
tell me though?

Nothing, because it tells you something about correlations on single
vertices, (e.g. in-out-degrees, etc), not neighbours.

That makes sense. So while avg_neighbour_corr tells me what degree the
neighbouring vertices are likely to have, avg_combined_corr tells me e.g.
what out-degree a given vertex is likely to have, on average, given its
in-degree. Thank you!