It is called "joining" or "combining" two things together.
Many words come to mind, depending on the situation. Reminiscent. Familiar. Deja vu.
It is called symbolism when an object or person or place or experience represents something else, typically something abstract or intangible. Symbolism is a literary technique that adds depth and significance to a story or work of art.
Particles is one thing, waves is something else. Heat transferred by the motion of particles can be conduction or convection. Heat transferred by electromagnetic waves is radiation.
There is no such thing as a "stationary" object. Every motion is always measured relative to something else, which, coincidentally, is what the question is all about. The thing against which motion is measured is called the "reference frame".
Those objects are called reflectors. They bounce light rays back in the direction from which they came.
It is called a metaphor.
eclipse
a buthole
perhaps an allegory, or a parable
something is a thing that is some. or one thing that is not everything else.
Such a relationship is parasitic, the one stealing the nutrients is called a parasite, the one being stolen from is called the host.
Could be a hypocrite , refers to people who are considered to be insincere
satellite
the thing that you do that makes something else do something
Many words come to mind, depending on the situation. Reminiscent. Familiar. Deja vu.
Metaphor.
It became Congo. The Zaire river is the Congo river. It is the same thing, it is now just called something else.