Improvisation is an art of creating something in the moment, without prior preparation or planning. It is a valuable skill in music and theater industries, as well as in everyday life. However, there are various synonyms for improvisation that can be used depending on the context. For example, ad-libbing refers to improvising dialogue or actions in a performance. On-the-spot, spontaneity, and extemporization all convey the idea of improvising without prior preparation. Flexibility and adaptability are other words that can be used to describe the ability to improvise. All these synonyms are useful in different settings, whether it's in the arts or in situations that require quick thinking and problem-solving.