Verb + suffix
Many nouns are formed in this way.
Adjective + suffix
Nouns are also formed by adding a suffix to an adjective. Two suffixes often added to adjectives to form nouns are -ness and -ity
The addition of these suffixes may change the pronunciation.
Nouns ending -ion or -ity have the main stress on the syllable before, so the pronunciation may be different from the verb or adjective:
-er/-or and -ist
These are common noun suffixes added to existing nouns or verbs, and they describe people and their jobs.