ecology vs association

ecology and association both are nouns.

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

ecology (noun)	association (noun)
the branch of biology concerned with the relations between organisms and their environment	the act of consorting with or joining with others
the environment as it relates to living organisms	the process of bringing ideas or events together in memory or imagination
	a formal organization of people or groups of people
	(ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species
	(chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding
	a relation resulting from interaction or dependence
	a social or business relationship
	the state of being connected together as in memory or imagination