scorn vs pooh-pooh

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

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

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

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

scorn (noun)	pooh-pooh (noun)
open disrespect for a person or thing
lack of respect accompanied by a feeling of intense dislike

scorn (verb)	pooh-pooh (verb)
reject with contempt	reject with contempt
look down on with disdain	express contempt about