Improvisers vs Improvises - What's the difference?
As a noun improvisers
As a verb improvises is
To make something up or invent it as one goes on; to proceed guided only by imagination, instinct, and guesswork rather than by a careful plan.
- He had no speech prepared, so he improvised .
- They improvised a simple shelter with branches and the rope they were carrying.
- She improvised a lovely solo.
* fly by the seat of one's pants, play by ear, punt, think on one's feet, wing it
* off the cuff