Cardiac glycoside and Steroid

Cardiac glycoside noun - Obtained from a number of plants and used to stimulate the heart in cases of heart failure.

Steroid and cardiac glycoside are semantically related. In some cases you can use "Steroid" instead a noun phrase "Cardiac glycoside".

Steroid noun - Any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects.

Cardiac glycoside and steroid are semantically related. Sometimes you can replace phrase "Cardiac glycoside" with "Steroid", this terms are similar.