Engineering science and Mechanical engineering

Engineering science noun - The discipline dealing with the art or science of applying scientific knowledge to practical problems.

Mechanical engineering and engineering science are semantically related. In some cases you can use "Mechanical engineering" instead a noun phrase "Engineering science".

Mechanical engineering noun - The branch of engineering that deals with the design and construction and operation of machinery.

Engineering science and mechanical engineering are semantically related. You can use "Engineering science" instead a noun phrase "Mechanical engineering".