The definitions seem very much alike:
superposed – Place (something) on or above something else, esp. so
that they coincide: "superposed triangles".superimpose – Place or lay (one thing) over another, typically so that both are still evident.
Are they just synonyms?
Best Answer
They are synonyms but have different scopes of usage.
Superimpose is the term found in general use.
Superpose is used mostly in scientific or mathematical contexts; see 'superposition'.