haemodialysis vs dialysis

haemodialysis and dialysis both are nouns.

Word	Noun	Adjective	Verb	Adverb
haemodialysis	Yes	No	No	No
dialysis	Yes	No	No	No

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

haemodialysis: dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure
dialysis: separation of substances in solution by means of their unequal diffusion through semipermeable membranes

haemodialysis (noun)	dialysis (noun)
dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure	separation of substances in solution by means of their unequal diffusion through semipermeable membranes