Improvise vs. Extemporise

Improviseverb

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.

Improviseverb

To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously.

Improviseverb

To bring about, arrange, do, or make, immediately or on short notice, without previous preparation and with no known precedent as a guide.

Improviseverb

To invent, or provide, offhand, or on the spur of the moment; as, he improvised a hammer out of a stone.

Improviseverb

To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand.

Improviseverb

perform without preparation;

Improviseverb

manage in a makeshift way; do with whatever is at hand;

Extemporiseverb

(intransitive) To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.

Extemporiseverb

(intransitive) To do something in a makeshift way.

Extemporiseverb

(transitive) To make or create extempore.

Extemporiseverb

To compose extemporaneously or improvise.

Extemporiseverb

perform without preparation;