wonderland vs solid ground

wonderland and solid ground both are nouns.

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

As nouns, solid ground is a hypernym of wonderland; that is, solid ground is a word with a broader meaning than wonderland:

Other hypernyms of wonderland include dry land, earth, ground, land, terra firma.

wonderland (noun)	solid ground (noun)
an imaginary realm of marvels or wonders	the solid part of the earth's surface
a place or scene of great or strange beauty or wonder