Improv and Spur-of-the-moment

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

Spur-of-the-moment and improv are semantically related in extemporaneous topic. In some cases you can use "Spur-of-the-moment" instead an adjective "Improv", when it comes to topics like impromptu, unrehearsed, improvised.

Spur-of-the-moment adjective - Made or done without previous thought or preparation.

Improv and spur-of-the-moment are semantically related in extemporaneous topic. Sometimes you can use "Improv" instead the phrase "Spur-of-the-moment" as an adjective or an adverb.