root celery vs Apium graveolens rapaceum

root celery and Apium graveolens rapaceum both are nouns.

Word	Noun	Adjective	Verb	Adverb
root celery	Yes	No	No	No
Apium graveolens rapaceum	Yes	No	No	No

As nouns, root celery and Apium graveolens rapaceum are synonyms defined as:

root celery and Apium graveolens rapaceum: grown for its thickened edible aromatic root

Other synonyms of root celery include celeriac, celery root, knob celery, turnip-rooted celery.

root celery (noun)	Apium graveolens rapaceum (noun)
grown for its thickened edible aromatic root	grown for its thickened edible aromatic root