yellow-bellied vs white-livered

yellow-bellied and white-livered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
yellow-bellied	No	Yes	No	No
white-livered	No	Yes	No	No

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

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

yellow-bellied (adjective)	white-livered (adjective)
easily frightened	easily frightened