How to spell COPOUNDS correctly?

If you meant compounding, you could use that. Alternatively, if you meant covalent bonds, you could use that. If you were trying to refer to chemical compounds made up of more than one element, you could use the word "complexes" or "molecules."

• compounds The chemist was able to identify the compounds in the solution using a spectrometer.
• pounds I need to lose ten pounds before summer vacation.

Putrefication

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