delta vs equilateral triangle

delta and equilateral triangle both are nouns.

Word	Noun	Adjective	Verb	Adverb
delta	Yes	No	No	No
equilateral triangle	Yes	No	No	No

As nouns, equilateral triangle is a hypernym of delta; that is, equilateral triangle is a word with a broader meaning than delta:

Other hypernyms of delta include equiangular triangle.

delta (noun)	equilateral triangle (noun)
the 4th letter of the Greek alphabet	a three-sided regular polygon
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