solid ground vs world

solid ground and world both are nouns.

Word	Noun	Adjective	Verb	Adverb
solid ground	Yes	No	No	No
world	Yes	Yes	No	No

solid ground (noun)	world (noun)
the solid part of the earth's surface	all of the living human inhabitants of the earth
	all of your experiences that determine how things appear to you
	the concerns of this life as distinguished from heaven and the afterlife
	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

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