Architectural ornament and Key pattern

Architectural ornament noun - (architecture) something added to a building to improve its appearance.

Key pattern and architectural ornament are semantically related. In some cases you can replace phrase "Key pattern" with "Architectural ornament", this phrases are similar.

Key pattern noun - An ornamental pattern consisting of repeated vertical and horizontal lines (often in relief).

Architectural ornament and key pattern are semantically related. You can use "Architectural ornament" instead a noun phrase "Key pattern".