Greek fret vs key pattern

Greek fret and key pattern both are nouns.

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

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

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

Other synonyms of Greek fret include fret, Greek key.

Greek fret (noun)	key pattern (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)