macrocosm vs cosmos

macrocosm and cosmos both are nouns.

Word	Noun	Adjective	Verb	Adverb
macrocosm	Yes	No	No	No
cosmos	Yes	No	No	No

As nouns, macrocosm and cosmos are synonyms defined as:

Other synonyms of macrocosm include creation, existence, universe, world.

macrocosm (noun)	cosmos (noun)
everything that exists anywhere	everything that exists anywhere
	any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals