im·prov·i·sa·tor 
(ĭm-prŏvĭ-zā′tər)
(ĭm-prŏvĭ-zā′tər)n.
One who improvises.
- prothetic
- prothetically
- prothonotarial
- prothonotary
- prothonotary apostolic
- prothonotary apostolic
- prothonotary warbler
- prothoracic
- prothoracic gland
- prothorax
- prothrombin
- protist
- protistan
- protistology
- protium
- proto-
- Proto-Algonquian
- protoceratops
- protocol
- protocolar
- protocolary
- protoctist
- protoderm
- protodermal
- protogalaxy