Greek alphabet vs delta

Greek alphabet and delta both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greek alphabet	Yes	No	No	No
delta	Yes	No	No	No

Greek alphabet (noun)	delta (noun)
the alphabet used by ancient Greeks	the 4th letter of the Greek alphabet
	a low triangular area of alluvial deposits where a river divides before entering a larger body of water
	an object shaped like an equilateral triangle