Which of the following words describes a thickening or solidifying process?

The term "coagulation" specifically refers to the process by which a liquid, often in a biological context, thickens or solidifies. This is most commonly associated with the transformation of liquid blood into a semi-solid state, forming a clot. Coagulation occurs through a series of complex biochemical reactions, primarily involving proteins and platelets that function together to create a gel-like substance, which helps in wound healing and prevents excessive bleeding.

In contrast, the other words do not relate to the process of thickening or solidifying. For example, "canvass" refers to the act of soliciting votes, opinions, or support, and has no connection to physical changes in states of matter. "Coerce" means to persuade someone to do something through force or threats, again unrelated to any solidification process. "Clamor" refers to a loud and confused noise, or a strong expression of public demand, which also does not pertain to physical states or transformations. Therefore, coagulation stands out as the correct word describing the thickening or solidifying process, especially in terms of liquid becoming more viscous or solid.