Final answer:
The antonym of sponger, freeloader, and leech is someone who is self-sufficient, such as a benefactor, contributor, or supporter, as they provide rather than take resources or support.
Step-by-step explanation:
The antonym of sponger, freeloader, and leech is someone who is self-sufficient, independent, or a provider. These terms generally describe a person who is the direct opposite of someone who relies on others for support without giving anything in return.
A benefactor, contributor, or supporter would be antonyms for sponger, freeloader, and leech, as these individuals offer help or resources to others rather than taking them.
The antonym of sponger, freeloader, and leech is contributor. A contributor is someone who actively adds or gives rather than taking or relying on others for support. For example, in a group project, a contributor would actively participate and contribute their ideas and efforts.