-er/-or: These suffixes are commonly used to form nouns that denote a person or thing that performs an action. For example:
* Supporter: A person who supports something.
* Sustainer: A person or thing that provides support or sustenance.
-ive: This suffix is used to form adjectives that describe something that supports or helps. For example:
* Supportive: Giving support or encouragement.
* Assistive: Providing aid or support.
-able: This suffix is used to form adjectives that describe something capable of being supported. For example:
* Supportable: Able to be supported or justified.
* Sustainable: Able to be supported or maintained over time.
-ment: This suffix is used to form nouns that represent the act or process of something. For example:
* Supportment: The act of supporting something. (This word is less commonly used and may sound awkward.)
Ultimately, the best suffix to use will depend on the specific meaning you want to convey.