CD player and Scientific knowledge

CD player noun - A stand-alone piece of electronic equipment that either has its own display or attaches to a television set.

Scientific knowledge and CD player are semantically related. In some cases you can use "Scientific knowledge" instead a noun phrase "CD player".

Scientific knowledge noun - Knowledge accumulated by systematic study and organized by general principles.

CD player and scientific knowledge are semantically related. Sometimes you can use "CD player" instead a noun phrase "Scientific knowledge".