reject vs pooh-pooh

reject is a noun but pooh-pooh is not a noun.

Word	Noun	Adjective	Verb	Adverb
reject	Yes	No	Yes	No
pooh-pooh	No	No	Yes	No

As verbs, reject and pooh-pooh are synonyms defined as:

Other synonyms of reject include disdain, freeze off, scorn, spurn, turn down.

reject (noun)	pooh-pooh (noun)
the person or thing that is rejected or set aside as inferior in quality

reject (verb)	pooh-pooh (verb)
not accept something given or offered	reject with contempt
dismiss from consideration or a contest	express contempt about
deem wrong or inappropriate
reject with contempt
not accept as true
refuse entrance or membership
resist immunologically the introduction of some foreign tissue or organ