Nitty-gritty and Underlying

Nitty-gritty adjective - Having to do with the practical details of regular life.

Underlying and nitty-gritty are semantically related In some cases you can use "Underlying" instead an adjective phrase "Nitty-gritty".

Underlying adjective - Of or relating to the simplest facts or theories of a subject.

Nitty-gritty and underlying are semantically related in fundamental topic. Sometimes you can use "Nitty-gritty" instead an adjective "Underlying".