How to spell PROFFESOR correctly?

The correct spelling of "proffesor" is "professor". To avoid this misspelling, one can remember that the word "professor" has only one "f" and two "s's". Another tip is to use spell-check and proofread one's work before finalizing it.

• professor The professor assigned a difficult task to the students.
• proffer I would like to proffer my services to your organization.

Putrefication

• nitrification
• petrifaction
• purification
• putrefaction
• putrification
• vitrification