dry land vs solid ground

dry land and solid ground both are nouns.

Word	Noun	Adjective	Verb	Adverb
dry land	Yes	No	No	No
solid ground	Yes	No	No	No

As nouns, dry land and solid ground are synonyms defined as:

Other synonyms of dry land include earth, ground, land, terra firma.

dry land (noun)	solid ground (noun)
the solid part of the earth's surface	the solid part of the earth's surface