fuss-budget vs wet blanket

fuss-budget and wet blanket both are nouns.

Word	Noun	Adjective	Verb	Adverb
fuss-budget	Yes	No	No	No
wet blanket	Yes	No	No	No

As nouns, wet blanket is a hypernym of fuss-budget; that is, wet blanket is a word with a broader meaning than fuss-budget:

Other hypernyms of fuss-budget include killjoy, party pooper, spoilsport.

fuss-budget (noun)	wet blanket (noun)
thinks about unfortunate things that might happen	someone who spoils the pleasure of others