Modifiers matching duck:

• small,
• marine,
• breeding,
• wild,
• native,
• common,
• rare,
• smaller,
• large,
• here,
• larger,
• unusual,
• domestic,
• indigenous,

Simple categories matching unusual:

• textile,
• event,
• turtle,
• fabric,
• material,
• scene,
• thing,
• dance,
• animal,
• disturbance,
• pet,
• outlet,
• cancer,
• gem,
• state,
• creature,
• experience,
• car,
• occurrence,
• stain,
• item,
• facility,
• color,
• museum,
• watch,
• condition,
• substrate,
• typeface,
• fibre,
• change,
• vegetable,
• host,
• value,
• weapon,
• rock,
• vessel,
• merchandise,
• flora,
• cost,
• sign,
• pipe,
• assets,
• pest,
• papers,
• fish,
• ability,
• site,
• flavor,
• grain,
• antiquity,
• fluid,
• piece,
• symptom,
• lily,
• accessory,
• environment,
• happening,
• music,
• use,
• pattern,
• festival,
• size,
• system,
• thought,
• gift,
• movement,
• option,
• neoplasm,
• constituent,
• joint,
• fruit,
• surface,
• restaurant,
• coral,
• circumstances,
• stone,
• aroma,
• critter,
• ingredient,
• spice,
• livestock,
• illness,
• ulcer,
• accident,
• soap,
• situation,
• sensation,
• atom,
• species,
• interest,
• word,
• oddity,
• wool,
• opponent,
• hardwood,
• story,
• category,
• tumour,
• medium,
• basil,
• metal,
• substance,
• design,
• action,
• object,
• product,
• home,
• leaf,
• smell,
• treatment,
• topic,
• service,
• seed,
• storm,
• feature,
• noise,
• odour,
• suspect,
• meat,
• structure,
• measure,
• behavior,
• document,
• drink,
• attribute,
• sound,
• reaction,
• tool,
• case,
• tissue,
• disease,
• complication,
• trade,
• entertainment,
• instance,
• tree,
• legs,
• difficulty,
• truck,
• combination,
• mammal,
• discomfort,
• dish,
• container,
• shock,
• food,
• organ,
• danger,
• response,
• domain,
• invertebrate,
• component,
• odor,
• wound,
• chemical,
• prey,
• organs,
• characteristic,
• bacteria,
• formation,
• transaction,
• commodity,
• deposit,
• fixture,
• character,
• activity,
• circumstance,
• contaminant,
• vegetation,
• pathogen,
• climate,
• decoration,
• woodwind,
• area,
• organism,
• problem,
• fiber,
• losses,
• herb,
• windows,
• means,
• niche,
• compound,
• key,
• flower,
• quality,
• instrument,
• motion,
• project,
• symbol,
• plant,
• boat,
• variation,
• toy,
• requirement,
• collection,
• style,
• filling,
• delicacy,
• stuff,
• shape,
• cheese,
• shade,
• yarn,
• phenomenon,
• nature,
• ornamentation,
• wind,
• battery,
• bill,
• fare,
• tulip,
• predator,
• portion,
• property,
• occasion,
• vehicle,
• touch,
• layout,
• conformation,
• duck,
• incident,
• salt,
• suicide,
• flute,
• gun,
• sport,
• expenditure,
• flavouring,
• trait,
• group,
• obstacle,
• behaviour,
• art,
• bird,
• cycle,
• competition,
• ornamental,
• disorder,
• location,
• installation,
• tumor,
• perception,
• appearance,
• flavour,
• entity,
• scent,
• weather,
• gemstone,
• pathology,
• procedure,
• malignancy,
• insect,
• mineral,
• fear,
• operations,
• marking,
• building,
• sweetener,
• business,
• individual,
• region,
• layer,
• instrumentation,
• infection,
• idea,
• alloy,
• skill,
• conifer,
• stem,
• wine,
• hazard,
• tradition,
• cause,
• process,
• equipment,
• wood,
• mixture,
• place,
• space,
• tremor,
• contingency,
• flavoring,
• pizza,
• beer,
• sauce,
• obstruction,
• acid,
• recording,
• chocolate,
• power,
• spirits,
• flooring,