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required,requisite
Invaluable, indispensable, forgo, crucial, essential, fundamental, imperative, key, necessitous, needed, needful, prerequisite, primary, required, requisite, vital
This is your answer (synonyms of necessary below)
The word requisite means a thing that is necessary for the achievement of a specific end. Some synonyms for requisite are; essential, must, requirement, needful or indispensable.
needy- a person who need help
needful: required help