Modifiers matching lettuce:

• mixed,
• small,
• bitter,
• crisp,
• hearty,
• torn,
• new,
• leafy,
• dark,
• mild,
• clean,
• fresh,

Simple categories matching bitter:

• sister,
• general,
• agent,
• person,
• villain,
• food,
• drink,
• bully,
• composer,
• alkaloid,
• lettuce,
• tyrant,
• liquid,
• psychopath,
• writer,
• flavour,
• terrorist,
• pianist,
• assassin,
• criminal,
• warrior,
• fool,
• child,
• wizard,
• dictator,
• constituent,
• green,
• husband,
• spice,
• flavor,
• citrus,
• poet,
• herb,
• stout,
• musician,
• athlete,
• substance,
• drug,
• bodybuilder,
• god,
• beverage,
• gladiator,
• thing,
• veggie,
• leaf,
• salad,
• demon,
• traitor,
• thug,
• stimulant,
• material,
• chicory,
• son,
• feed,
• beer,
• humorist,
• ingredient,
• magician,
• compound,
• vegetable,