Assist

Mainstay

A person or thing that acts as a chief support or part.

Proponent

A person who puts forward a proposition or proposal.

Bolster

Anything resembling this in form or in use as a support.

Countenance

Appearance, especially the look or expression of the face.

Munificent

Extremely liberal in giving; very generous.

Sustenance

Means of sustaining life; nourishment.

Stalwart

Strongly and stoutly built; sturdy and robust.

Ancillary

Subordinate; subsidiary.

Abet

To encourage, support, or countenance by aid or approval, usually in wrongdoing.

Corroborate

To make more certain; confirm.

Espouse

To make one's own; adopt or embrace, as a cause.

Advocate

To speak or write in favor of; support or urge by argument; recommend publicly.