haematologist vs hematologist

haematologist and hematologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
haematologist	Yes	No	No	No
hematologist	Yes	No	No	No

As nouns, haematologist and hematologist are synonyms defined as:

haematologist and hematologist: a doctor who specializes in diseases of the blood and blood-forming organs

haematologist (noun)	hematologist (noun)
a doctor who specializes in diseases of the blood and blood-forming organs	a doctor who specializes in diseases of the blood and blood-forming organs