Hereditary disease and Lactase deficiency

Hereditary disease noun - A disease or disorder that is inherited genetically.

Lactase deficiency and hereditary disease are semantically related. In some cases you can replace phrase "Lactase deficiency" with "Hereditary disease", this phrases are similar.

Lactase deficiency noun - Congenital disorder consisting of an inability to digest milk and milk products; absence or deficiency of lactase results in an inability to hydrolyze lactose.

Hereditary disease and lactase deficiency are semantically related. You can use "Hereditary disease" instead a noun phrase "Lactase deficiency".