Modifiers matching duck:

• here,
• jealous,
• short-tempered,
• tenacious,
• slobbery,
• small,
• determined,
• domestic,
• boastful,
• pushy,
• insecure,
• zany,
• lisping,
• optimistic,
• smaller,
• large,
• brash,
• rare,
• larger,
• indigenous,
• daffy,
• breeding,
• native,
• marine,
• bullying,
• paranoid,
• aggressive,
• wild,
• unusual,
• common,

Simple categories matching daffy:

• recluse,
• person,
• duck,
• philanthropist,
• billionaire,