prolusion /prə-, prō-looˈzhən or -lūˈ/

1. A preliminary performance, activity or display
2. An essay preparatory to a more solid treatise

• photophores
• photophoreses
• photophoresis
• photopia
• photopias
• photopic
• photopolarimeter
• photopolymer
• photopositive
• not up to much
• Notus
• not very
• notwithstanding
• not worth a damn
• not worth a day's purchase
• not worth shucks
• no two ways about it
• nougat
• nougatine
• nougatines
• nougats
• nought
• noughties
• noughts
• noughts and crosses