Gaunt and Skin and bones

Gaunt adjective - Suffering extreme weight loss as a result of hunger or disease.

Skin and bones and gaunt are semantically related in skinny topic. In some cases you can use "Skin and bones" instead an adjective "Gaunt".

Skin and bones noun - A person who is unusually thin and scrawny.

Gaunt and skin and bones are semantically related in pale topic. You can use "Gaunt" instead an adjective phrase "Skin and bones", if it concerns topics such as emaciated, wasted, undernourished, very thin.