zikkurat vs ziggurat

zikkurat and ziggurat both are nouns.

Word	Noun	Adjective	Verb	Adverb
zikkurat	Yes	No	No	No
ziggurat	Yes	No	No	No

As nouns, zikkurat and ziggurat are synonyms defined as:

zikkurat and ziggurat: a rectangular tiered temple or terraced mound erected by the ancient Assyrians and Babylonians

Other synonyms of zikkurat include zikurat.

zikkurat (noun)	ziggurat (noun)
a rectangular tiered temple or terraced mound erected by the ancient Assyrians and Babylonians	a rectangular tiered temple or terraced mound erected by the ancient Assyrians and Babylonians