Simple categories matching secretory:

• organs,
• enzyme,
• tissue,
• component,
• fluid,
• unit,
• gland,
• protein,
• system,
• organelle,
• cell,
• compartment,
• structure,
• cavity,

Members with property secretory:

• immunoglobulin,
• pineal_gland,
• liver,
• pancreas,
• cervical_fluid,
• salivary_gland,
• duct,
• saliva,
• mucosal_fluid,
• oil_cell,
• serum_glycoprotein,
• gastrointestinal_fluid,
• kidney,
• breast,
• intestine,
• neural_cell,
• digestive_gland,
• small_intestine,
• serum,
• toad_bladder,
• neuroendocrine_cell,
• yolk_protein,
• yeast,
• frog_skin,
• liver_albumin,
• cavity,
• fungi,
• mammary_gland,
• seminal_fluid,
• lysozyme,
• fibrinogen,
• ependyma,
• resin_cell,
• urine,
• morphology,
• digestive_enzyme,
• stomach,
• breast_milk,
• milk,
• er,
• digestive_tract,
• olfactory_epithelium,
• oil_cavity,
• amniotic_fluid,
• bile,
• oil,
• adrenal_gland,
• enamel_epithelium,
• neuron,
• acidic_phosphatase,
• transferrin,
• mutant_fibrinogen,
• thyroid,
• enzyme,
• lacrimal_gland,
• salt_gland,
• psa,
• complement_protein,
• parotid_gland,
• protease,
• sputum,
• interleukin,
• exocrine_cell,
• albumin,
• generative_gland,
• synovial_fluid,
• parathyroid_cell,
• gut_lumen,
• placenta,
• sweat,
• eosinophil,
• extracellular_transport,
• glycoprotein,
• glandular_hair,
• melanocyte,
• collagen,
• erythropoietin,
• mucus,
• testis,
• intestinal_cell,
• prostate,
• gland,
• cerebrospinal_fluid,
• parathyroid,
• adrenal_medulla,
• eye,
• sod,
• gland_duct,
• pancreatic_cell,
• thyroid_cell,
• ovary,
• gonad,
• digestive_organs,
• adrenal_cell,
• spleen,
• salivary_protein,
• brain,
• kidney_tubule,
• collagenase,
• lung,
• human_milk,
• gut,
• pancreatic_juice,
• cervical_mucus,
• endocrine_cell,
• endocrine,
• exocrine_pancreas,
• human_saliva,
• secretory_cavity,
• hepatic_bile,
• nasal_fluid,
• neurotransmitter_release,
• mammary_tissue,
• colostrum,
• gut_mucosa,
• antibody,
• heart,
• nuclease,
• semen,
• amylase,
• neck,
• resin_duct,
• oil_canal,
• pituitary,
• respiratory_organs,
• lipase,
• certain_neuron,