ergonomics vs applied science

ergonomics and applied science both are nouns.

Word	Noun	Adjective	Verb	Adverb
ergonomics	Yes	No	No	No
applied science	Yes	No	No	No

As nouns, applied science is a hypernym of ergonomics; that is, applied science is a word with a broader meaning than ergonomics:

ergonomics: the branch of engineering science in which biological science is used to study the relation between workers and their environments
applied science: the discipline dealing with the art or science of applying scientific knowledge to practical problems

Other hypernyms of ergonomics include engineering, engineering science, technology.

ergonomics (noun)	applied science (noun)
the branch of engineering science in which biological science is used to study the relation between workers and their environments	the discipline dealing with the art or science of applying scientific knowledge to practical problems