Celt vs Kelt

Celt and Kelt both are nouns.

Word	Noun	Adjective	Verb	Adverb
Celt	Yes	No	No	No
Kelt	Yes	No	No	No

As nouns, Celt and Kelt are synonyms defined as:

Celt and Kelt: a member of a European people who once occupied Britain and Spain and Gaul prior to Roman times

Celt (noun)	Kelt (noun)
a member of a European people who once occupied Britain and Spain and Gaul prior to Roman times	a member of a European people who once occupied Britain and Spain and Gaul prior to Roman times