Which Word Doesn't Belong?

menu, table, waitress, shirt

• menu

• table

• waitress

• shirt

math, shopping, reading, science

• math

• shopping

• reading

• science

spoon, fork, plate, knife

• spoon

• fork

• plate

• knife

mountain, river, stream, lake

• mountain

• river

• stream

• lake

robin, blue jay, mouse, penguin

• robin

• blue jay

• mouse

• penguin

boat, airplane, helicopter, jet

• boat

• airplane

• helicopter

• jet

hot dog, hamburger, ketchup, chicken

• hot dog

• hamburger

• ketchup

• chicken

red, green, plant, orange

• red

• green

• plant

• orange

friend, sister, brother, cousin

• friend

• sister

• brother

• cousin

clean, sad, happy, angry

• clean

• sad

• happy

• angry