disdain vs pooh-pooh

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

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

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

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

disdain (noun)	pooh-pooh (noun)
a communication that indicates lack of respect by patronizing the recipient
lack of respect accompanied by a feeling of intense dislike

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