Modifiers matching opening:

• small,
• symmetrical,
• epidermal,
• natural,
• necessary,
• exterior,
• operational,
• typical,
• fleshy,
• narrow,
• trim,
• structural,
• close,
• vertical,
• horizontal,
• prepared,
• adjacent,
• off,
• over,
• permanent,
• conventional,
• large,
• outside,
• curved,
• gothic,
• external,
• larger,
• architectural,
• fixed,
• circular,
• size,
• outer,
• accessible,
• fine,
• mechanical,
• decorative,
• smaller,
• developing,
• outdoor,
• underground,
• surrounding,
• important,
• rectangular,
• framed,

Simple categories matching epidermal:

• thickness,
• tissue,
• disorder,
• area,
• structure,
• appendage,
• opening,
• outgrowth,
• feature,
• cell,
• process,
• change,
• condition,
• irregularity,
• disease,