Modifiers matching shampoo:

• gentle,
• animal,
• alkaline,
• mild,
• irritating,
• natural,
• special,
• delicate,

Simple categories matching gentle:

• cleanser,
• token,
• president,
• child,
• person,
• spice,
• shampoo,
• herb,
• politician,
• god,
• sound,
• hill,
• hero,
• bureaucrat,
• robot,
• poet,
• modality,
• mother,
• campaigner,
• spy,
• grain,
• friend,
• lover,
• sedative,
• therapy,
• sidekick,
• ingredient,
• animal,
• invalid,
• adventurer,
• fabric,
• father,
• creature,