middle voice from 5543; to show oneself useful, i.e. act benevolently:

KJV-- be kind.

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5543 chrestos (khrase-tos');

from 5530; employed, i.e. (by implication) useful (in manner or morals):

KJV-- better, easy, good (-ness), gracious, kind.

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5530 chraomai (khrah'-om-ahee);

middle voice of a primary verb ; to furnish what is needed; (give an oracle, "graze" [touch slightly], light upon, etc.), i.e. (by implication) to employ or (by extension) to act towards one in a given manner:

KJV-- entreat, use.