key pattern vs Greek key

key pattern and Greek key both are nouns.

Word	Noun	Adjective	Verb	Adverb
key pattern	Yes	No	No	No
Greek key	Yes	No	No	No

As nouns, key pattern and Greek key are synonyms defined as:

key pattern and Greek key: an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)

Other synonyms of key pattern include fret, Greek fret.

key pattern (noun)	Greek key (noun)
an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)	an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)