glioblastoma vs brain tumour

glioblastoma and brain tumour both are nouns.

Word	Noun	Adjective	Verb	Adverb
glioblastoma	Yes	No	No	No
brain tumour	Yes	No	No	No

As nouns, brain tumour is a hypernym of glioblastoma; that is, brain tumour is a word with a broader meaning than glioblastoma:

glioblastoma: a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal
brain tumour: a tumor in the brain

Other hypernyms of glioblastoma include brain tumor.

glioblastoma (noun)	brain tumour (noun)
a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal	a tumor in the brain