Bedrock and Nitty gritty

Bedrock noun - An immaterial thing upon which something else rests.

Nitty gritty and bedrock are semantically related In some cases you can replace phrase "Nitty gritty" with "Bedrock", this terms are similar.

Bedrock and nitty gritty are semantically related in basis for something physical or mental topic. Sometimes you can use "Bedrock" instead a noun phrase "Nitty gritty".