world vs galaxy

world and galaxy both are nouns.

Word	Noun	Adjective	Verb	Adverb
world	Yes	Yes	No	No
galaxy	Yes	No	No	No

world (noun)	galaxy (noun)
all of the living human inhabitants of the earth	(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
all of your experiences that determine how things appear to you	a splendid assemblage (especially of famous people)
the concerns of this life as distinguished from heaven and the afterlife	tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall
people in general; especially a distinctive group of people with some shared interest
people in general considered as a whole
the 3rd planet from the sun; the planet we live on
everything that exists anywhere
a part of the earth that can be considered separately

world (adjective)	galaxy (adjective)
involving the entire earth; not limited or provincial in scope