party pooper vs wet blanket

party pooper and wet blanket both are nouns.

Word	Noun	Adjective	Verb	Adverb
party pooper	Yes	No	No	No
wet blanket	Yes	No	No	No

As nouns, party pooper and wet blanket are synonyms defined as:

Other synonyms of party pooper include killjoy, spoilsport.

party pooper (noun)	wet blanket (noun)
someone who spoils the pleasure of others	someone who spoils the pleasure of others