haematology vs hematology

haematology and hematology both are nouns.

Word	Noun	Adjective	Verb	Adverb
haematology	Yes	No	No	No
hematology	Yes	No	No	No

As nouns, haematology and hematology are synonyms defined as:

haematology and hematology: the branch of medicine that deals with diseases of the blood and blood-forming organs

haematology (noun)	hematology (noun)
the branch of medicine that deals with diseases of the blood and blood-forming organs	the branch of medicine that deals with diseases of the blood and blood-forming organs