ecology vs biology

ecology and biology both are nouns.

Word	Noun	Adjective	Verb	Adverb
ecology	Yes	No	No	No
biology	Yes	No	No	No

As nouns, biology is a hypernym of ecology; that is, biology is a word with a broader meaning than ecology:

ecology: the branch of biology concerned with the relations between organisms and their environment
biology: the science that studies living organisms

Other hypernyms of ecology include biological science.

ecology (noun)	biology (noun)
the branch of biology concerned with the relations between organisms and their environment	the science that studies living organisms
the environment as it relates to living organisms	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms