Hejira vs Hegira

Hejira and Hegira both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hejira	Yes	No	No	No
Hegira	Yes	No	No	No

As nouns, Hejira and Hegira are synonyms defined as:

Hejira and Hegira: the flight of Muhammad from Mecca to Medina in 622 which marked the beginning of the Muslim era; the Muslim calendar begins in that year

Hejira (noun)	Hegira (noun)
the flight of Muhammad from Mecca to Medina in 622 which marked the beginning of the Muslim era; the Muslim calendar begins in that year	the flight of Muhammad from Mecca to Medina in 622 which marked the beginning of the Muslim era; the Muslim calendar begins in that year