radiobiologist vs biologist

radiobiologist and biologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiobiologist	Yes	No	No	No
biologist	Yes	No	No	No

As nouns, biologist is a hypernym of radiobiologist; that is, biologist is a word with a broader meaning than radiobiologist:

radiobiologist: a biologist who studies the effects of radiation on living organisms
biologist: (biology) a scientist who studies living organisms

Other hypernyms of radiobiologist include life scientist.

radiobiologist (noun)	biologist (noun)
a biologist who studies the effects of radiation on living organisms	(biology) a scientist who studies living organisms