white-livered vs chicken

white-livered is not a noun while chicken is a noun.

Word	Noun	Adjective	Verb	Adverb
white-livered	No	Yes	No	No
chicken	Yes	Yes	No	No

As adjectives, white-livered and chicken are synonyms defined as:

Other synonyms of white-livered include chickenhearted, lily-livered, yellow-bellied, yellow.

white-livered (noun)	chicken (noun)
	a domestic fowl bred for flesh or eggs; believed to have been developed from the red jungle fowl
	a foolhardy competition; a dangerous activity that is continued until one competitor becomes afraid and stops
	the flesh of a chicken used for food
	a person who lacks confidence, is irresolute and wishy-washy

white-livered (adjective)	chicken (adjective)
easily frightened	easily frightened