* Manicure: A cosmetic treatment for the fingernails and hands.
* Manuscript: A handwritten document.
* Manual: A book of instructions.
* Manufacture: To make something, usually on a large scale.
* Manometer: An instrument used to measure pressure.
* Manipulation: The act of controlling or influencing someone or something.
* Mandible: The lower jawbone.
* Manifest: To show or make something clear.
If you were thinking of a different prefix, please provide more information and I'll be happy to help!