Modifiers matching duck:

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

Simple categories matching lisping:

• duck,
• person,
• child,
• villain,