attar of roses vs atar

attar of roses and atar both are nouns.

Word	Noun	Adjective	Verb	Adverb
attar of roses	Yes	No	No	No
atar	Yes	No	No	No

As nouns, atar is a hypernym of attar of roses; that is, atar is a word with a broader meaning than attar of roses:

attar of roses: a volatile fragrant oil obtained from fresh roses by steam distillation
atar: essential oil or perfume obtained from flowers

Other hypernyms of attar of roses include athar, attar, ottar.

attar of roses (noun)	atar (noun)
a volatile fragrant oil obtained from fresh roses by steam distillation	essential oil or perfume obtained from flowers