dialysis vs chemical analysis

dialysis and chemical analysis both are nouns.

Word	Noun	Adjective	Verb	Adverb
dialysis	Yes	No	No	No
chemical analysis	Yes	No	No	No

As nouns, chemical analysis is a hypernym of dialysis; that is, chemical analysis is a word with a broader meaning than dialysis:

dialysis: separation of substances in solution by means of their unequal diffusion through semipermeable membranes
chemical analysis: the act of decomposing a substance into its constituent elements

Other hypernyms of dialysis include qualitative analysis.

dialysis (noun)	chemical analysis (noun)
separation of substances in solution by means of their unequal diffusion through semipermeable membranes	the act of decomposing a substance into its constituent elements