chicken vs white-livered

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

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

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

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

chicken (noun)	white-livered (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

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