Digitigrade and Eutherian

Digitigrade noun - An animal that walks so that only the toes touch the ground as e.g. dogs and cats and horses.

Eutherian and digitigrade are semantically related. In some cases you can use "Eutherian" instead a noun "Digitigrade".

Eutherian noun - Mammals having a placenta; all mammals except monotremes and marsupials.

Digitigrade and eutherian are semantically related. Sometimes you can replace term "Digitigrade" with "Eutherian", this nouns are similar.