good-king-henry vs fat hen

good-king-henry and fat hen both are nouns.

Word	Noun	Adjective	Verb	Adverb
good-king-henry	Yes	No	No	No
fat hen	Yes	No	No	No

As nouns, good-king-henry and fat hen are synonyms defined as:

good-king-henry and fat hen: European plant naturalized in North America; often collected from the wild as a potherb

Other synonyms of good-king-henry include allgood, Chenopodium bonus-henricus, wild spinach.

good-king-henry (noun)	fat hen (noun)
European plant naturalized in North America; often collected from the wild as a potherb	European plant naturalized in North America; often collected from the wild as a potherb