As a native English speaker, I find that it is quite frequent that I know exactly what a word means when it is put in a sentence but on the other hand, if someone asks for the definition of that word, it can require some thinking to figure it out. But here is some info about aircraft flight dynamics.
"What are the three dynamics of flight?
Flight dynamics is the science of air vehicle orientation and control in three dimensions. The three critical flight dynamics parameters are the angles of rotation in three dimensions about the vehicle's center of gravity (cg), known as pitch, roll and yaw."
The go-around involves a significant change in the pitch dynamic, more so than other changes such as top of descent, which is why it is mentioned more frequently in discussions about a go-around maneuver.
Airbus says this about the go-around "
The “all engines” go-around is a very dynamic procedure". That is because it involves a significant pitch change in a short period of time and its effect on pilots has led to accidents, which, once again, is why the focus on the go-around phase of flight for dynamics.