epicentre vs epicenter

epicentre and epicenter both are nouns.

Word	Noun	Adjective	Verb	Adverb
epicentre	Yes	No	No	No
epicenter	Yes	No	No	No

As nouns, epicentre and epicenter are synonyms defined as:

epicentre and epicenter: the point on the Earth's surface directly above the focus of an earthquake

epicentre (noun)	epicenter (noun)
the point on the Earth's surface directly above the focus of an earthquake	the point on the Earth's surface directly above the focus of an earthquake