doll's eyes vs herb Christopher

doll's eyes and herb Christopher both are nouns.

Word	Noun	Adjective	Verb	Adverb
doll's eyes	Yes	No	No	No
herb Christopher	Yes	No	No	No

As nouns, herb Christopher is a hypernym of doll's eyes; that is, herb Christopher is a word with a broader meaning than doll's eyes:

doll's eyes: North American herb with white poisonous berries
herb Christopher: a plant of the genus Actaea having acrid poisonous berries

Other hypernyms of doll's eyes include baneberry, cohosh.

doll's eyes (noun)	herb Christopher (noun)
North American herb with white poisonous berries	a plant of the genus Actaea having acrid poisonous berries