athar vs rose oil

athar and rose oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
athar	Yes	No	No	No
rose oil	Yes	No	No	No

As nouns, rose oil is a hyponym of athar; that is, rose oil is a word with a more specific, narrower meaning than athar:

athar: essential oil or perfume obtained from flowers
rose oil: a volatile fragrant oil obtained from fresh roses by steam distillation

Other hyponyms of athar include attar of roses.

athar (noun)	rose oil (noun)
essential oil or perfume obtained from flowers	a volatile fragrant oil obtained from fresh roses by steam distillation