Modifiers matching duck:

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

Simple categories matching jealous:

• teenager,
• person,
• criminal,
• fool,
• grump,
• pretender,
• killer,
• psychopath,
• duck,
• son,
• clown,
• tyrant,
• snob,
• aristocrat,
• genius,
• child,
• lover,
• pianist,
• villain,
• musician,
• composer,