refuse vs pass up

refuse is a noun but pass up is not a noun.

Word	Noun	Adjective	Verb	Adverb
refuse	Yes	No	Yes	No
pass up	No	No	Yes	No

As verbs, refuse and pass up are synonyms defined as:

Other synonyms of refuse include decline, reject, turn down.

refuse (noun)	pass up (noun)
food that is discarded (as from a kitchen)

refuse (verb)	pass up (verb)
show unwillingness towards	fail to acknowledge
not accept as true	not accept as true
refuse to let have
refuse entrance or membership
elude, especially in a baffling way
resist immunologically the introduction of some foreign tissue or organ