Turning adjectives into nouns using the suffixes -ity and -ness

The suffixes -ity and -ness turns adjectives into abstract nouns. When a word ends in a consonant, just add the suffix -ity; when it ends in ‘e’, remove the ‘e’, then add -ity. There are other patterns and irregular words, like ‘ability’ and ‘simplicity’. For most words, just add the suffix -ness; when a word ends in ‘y’, replace the ‘y’ with ‘i’, then add the suffix -ness. How to spell the curriculum words: business and opportunity.