How to spell CAUSTIONS correctly?

If you meant "cautions", then some possible suggestions could be warnings, advice or instructions. If you meant "caustions", then it may be a misspelling of "cautions" or "caustic."

• Cations Cations are positively charged ions that are formed when an atom loses one or more electrons.
• causation
• cautions The doctor cautions his patients to not skip their medications.
• cushions The cushions on the couch were soft and comfortable.

Intertubing

• antedating
• entertain
• entertainer
• entertaining
• inditing
• inner-tubing
• intertwine
• interurban
• intuiting
• undertaking