Dahna vs Rub al-Khali

Dahna and Rub al-Khali both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dahna	Yes	No	No	No
Rub al-Khali	Yes	No	No	No

As nouns, Dahna and Rub al-Khali are synonyms defined as:

Other synonyms of Dahna include Ad-Dahna Desert, Ar Rimsal, Great Sandy Desert.

Dahna (noun)	Rub al-Khali (noun)
a desert in southern Saudi Arabia	a desert in southern Saudi Arabia