biopsy vs blood test

biopsy and blood test both are nouns.

Word	Noun	Adjective	Verb	Adverb
biopsy	Yes	No	No	No
blood test	Yes	No	No	No

As nouns, blood test is a hyponym of biopsy; that is, blood test is a word with a more specific, narrower meaning than biopsy:

biopsy: examination of tissues or liquids from the living body to determine the existence or cause of a disease
blood test: a serologic analysis of a sample of blood

Other hyponyms of biopsy include chorionic villus biopsy, chorionic villus sampling, needle biopsy.

biopsy (noun)	blood test (noun)
examination of tissues or liquids from the living body to determine the existence or cause of a disease	a serologic analysis of a sample of blood