Dream up and Improv

Dream up verb - Devise or invent.

Improv and dream up are semantically related In some cases you can use "Improv" instead a verb "Dream up".

Improv noun - Something that is performed, made, or done without preparation.

Dream up and improv are semantically related in make up topic. Sometimes you can use "Dream up" instead a verb "Improv", if it concerns topics such as create.