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Ointment (uncountable noun) is a smooth oily substance that is rubbed on the skin for medicinal purposes.

For example:-

The doctor told me to apply the ointment to the wound twice a day.

An ornament (countable noun) is is something used purely for decoration, it has no practical purpose

For example:

The Spirit of Ecstasy is the bonnet ornament on Rolls-Royce cars.

For Hermine