mock-up

Short definition from Wiktionary

Noun

1. 1
   A scale or full-size model of a design or device which is not fully functional, used for teaching, demonstration, design evaluation, promotion, or other purposes.
2. 2
   A prototype, usually low-fidelity, such as a paper illustration, screenshot, or simple screen configuration with limited interaction.

Verb

1. 1
   To create a model or demonstration; to create a preliminary version or sample.