IPA: /ˌsuːpərɪmˈpoʊzəbl/
KK: /ˌsuːpərɪmˈpoʊzəbl/
Able to be placed on top of something else without changing the original.
The two images are superimposable, allowing us to compare them easily.
Superimposable → It is formed from "super-" (meaning above or over) and "imponere" (meaning to place). The word describes objects that can be placed over one another in such a way that they coincide perfectly.
Think of placing something 'above' ('super-') another object 'to place' ('imponere') — that's why superimposable means capable of being placed over each other.