Modifiers matching duck:

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

Simple categories matching lisping:

• person,
• child,
• villain,
• duck,