Congenital disease and Lactase deficiency

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

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

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