Genetic disease and Lactase deficiency

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

Lactase deficiency and genetic disease are semantically related. In some cases you can replace phrase "Lactase deficiency" with "Genetic 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.

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