lemongrass vs lemongrass oil

lemongrass and lemongrass oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
lemongrass	Yes	No	No	No
lemongrass oil	Yes	No	No	No

As nouns, lemongrass and lemongrass oil are synonyms defined as:

lemongrass and lemongrass oil: an aromatic oil that smells like lemon and is widely used in Asian cooking and in perfumes and medicines

Other synonyms of lemongrass include lemon grass.

lemongrass (noun)	lemongrass oil (noun)
a tropical grass native to India and Sri Lanka	an aromatic oil that smells like lemon and is widely used in Asian cooking and in perfumes and medicines
an aromatic oil that smells like lemon and is widely used in Asian cooking and in perfumes and medicines