If two things are superimposed, one is stacked over the other so that both become one.
If you transpose two things, you make them change places or reverse their normal order.
When you interpose, you interrupt or interfere in some fashion.
If someone is predisposed to something, they are made favorable or inclined to it in advance, or they are made susceptible to something, such as a disease.
When you propose something, you offer an idea or recommendation in the hope that it is accepted or adopted.
When you are disposed towards a particular thing, you are inclined or partial towards it.
When someone exhibits composure, they remain calm—even in trying circumstances.
Differentiated vocabulary for your students is just a click away.