Modifiers matching secretion:

• external,
• thick,
• watery,
• oral,
• mucosal,
• hormonal,
• male,
• respiratory,
• sweet,
• genital,
• animal,
• natural,
• digestive,
• physiological,
• biologic,
• typical,
• mammalian,
• accessible,
• acidic,
• neuroendocrine,
• infectious,
• alkaline,
• endocrine,
• viscous,
• biological,
• urinary,
• liquid,
• intestinal,

Simple categories matching digestive:

• enzyme,
• fluid,
• disorder,
• problem,
• structure,
• system,
• tissue,
• discomfort,
• matter,
• fruit,
• symptom,
• malady,
• fiber,
• disturbance,
• organs,
• organ,
• infection,
• upset,
• process,
• protease,
• cancer,
• herb,
• preparation,
• event,
• condition,
• compound,
• spice,
• disease,
• protein,
• complication,
• secretion,
• tract,
• acid,
• juice,
• substance,
• inhibitor,
• stuff,
• hormone,
• illness,
• gland,
• passageway,