ecology vs environment

ecology and environment both are nouns.

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

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

ecology (noun)	environment (noun)
the branch of biology concerned with the relations between organisms and their environment	the area in which something exists or lives
the environment as it relates to living organisms	the totality of surrounding conditions