Modifiers matching duck:

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

Simple categories matching short-tempered:

• duck,
• hero,
• sailor,
• person,
• hunter,