What is a synonym for "buttress"?

The term "buttress" refers to something that is used to support or reinforce an architectural structure, typically a wall, by providing additional strength and stability. In a broader sense, it can also refer to any support or aid that bolsters an argument or position. Therefore, "support" is the most fitting synonym, as it encapsulates the primary function of a buttress—providing strength and assistance.

While "wall" refers to a structural component, it does not convey the idea of support inherent in the meaning of "buttress". "Foundation" refers more specifically to the base or groundwork of a structure, which is related but distinct from the concept of support. "Lattice" pertains to a structure made of crisscrossed strips of material, often used for decoration or plant support, but it does not convey the idea of reinforcing or providing structural support like a buttress does. Hence, "support" is the best choice as it directly aligns with the intended meaning of the term.