Modifiers matching duck:

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

Simple categories matching here:

• duck,
• process,
• activity,