sustainer

Prop is a synonym of sustainer.

As nouns the difference between prop and sustainer

is that prop is an object placed against or under another, to support it; anything that supports or prop can be (theater|film) an item placed on a stage or set to create a scene or scenario in which actors perform contraction of "property" or prop can be the propeller of an aircraft or prop can be a proposition, especially on an election-day ballot while sustainer is one who sustains.

As a verb prop

is to support or shore up something.

As nouns the difference between reinforcement and sustainer

is that reinforcement is the act, process, or state of reinforcing or being reinforced while sustainer is one who sustains.

As nouns the difference between sustainer and help

is that sustainer is one who sustains while help is (uncountable) action given to provide assistance; aid.

As a verb help is

to provide assistance to (someone or something).

As a noun sustainer

is one who sustains.

As a verb sustained is

past tense of sustain.

As an adjective sustained is

held continuously at a certain level.

As nouns the difference between sustain and sustainer

is that sustain is (music) a mechanism which can be used to hold a note, as the right pedal on a piano while sustainer is one who sustains.

As a verb sustain

is to maintain, or keep in existence.