Dahna vs Ad-Dahna Desert

Dahna and Ad-Dahna Desert both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dahna	Yes	No	No	No
Ad-Dahna Desert	Yes	No	No	No

As nouns, Dahna and Ad-Dahna Desert are synonyms defined as:

Other synonyms of Dahna include Ar Rimsal, Great Sandy Desert, Rub al-Khali.

Dahna (noun)	Ad-Dahna Desert (noun)
a desert in southern Saudi Arabia	a desert in southern Saudi Arabia