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A synonym
light
The word that matches the definition of moral rightness is "integrity." Integrity refers to the quality of being honest and having strong moral principles.
Avoid
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reduce
The word that matches the definition of a small hill or mound is "knoll."
If referring to a person - 'prominent' , 'celebrated' .
A landfill.
constitution
aerodynamic...
Naming something by using a word that is closely related.