solid ground vs dry land

solid ground and dry land both are nouns.

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

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

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

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