chicken out vs pull out

chicken out and pull out both are verbs.

Word	Noun	Adjective	Verb	Adverb
chicken out	No	No	Yes	No
pull out	No	No	Yes	No

As verbs, chicken out and pull out are synonyms defined as:

Other synonyms of chicken out include back down, back off, bow out.

chicken out (verb)	pull out (verb)
remove oneself from an obligation	remove, usually with some force or effort; also used in an abstract sense
	move out or away
	bring, take, or pull out of a container or from under a cover
	remove oneself from an obligation