something having analogy to something else.

Biology . an organ or part analogous to another.

Chemistry . one of a group of chemical compounds similar in structure but different in respect to elemental composition.

a food made from vegetable matter, esp. soybeans, that has been processed to taste and look like another food, as meat or dairy, and is used as a substitute for it.

noun

congener , correlate , correlative , correspondent , counterpart , match