coriander vs coriander plant

coriander and coriander plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
coriander	Yes	No	No	No
coriander plant	Yes	No	No	No

As nouns, coriander and coriander plant are synonyms defined as:

coriander and coriander plant: Old World herb with aromatic leaves and seed resembling parsley

Other synonyms of coriander include Chinese parsley, cilantro, Coriandrum sativum.

coriander (noun)	coriander plant (noun)
parsley-like herb used as seasoning or garnish	Old World herb with aromatic leaves and seed resembling parsley
dried coriander seeds used whole or ground
Old World herb with aromatic leaves and seed resembling parsley