fjord vs fiord

fjord and fiord both are nouns.

Word	Noun	Adjective	Verb	Adverb
fjord	Yes	No	No	No
fiord	Yes	No	No	No

As nouns, fjord and fiord are synonyms defined as:

fjord and fiord: a long narrow inlet of the sea between steep cliffs; common in Norway

fjord (noun)	fiord (noun)
a long narrow inlet of the sea between steep cliffs; common in Norway	a long narrow inlet of the sea between steep cliffs; common in Norway