centring vs focussing

centring and focussing both are nouns.

Word	Noun	Adjective	Verb	Adverb
centring	Yes	No	No	No
focussing	Yes	No	No	No

As nouns, centring and focussing are synonyms defined as:

centring and focussing: the concentration of attention or energy on something

Other synonyms of centring include centering, direction, focal point, focus, focusing.

centring (noun)	focussing (noun)
(American football) putting the ball in play by passing it (between the legs) to a back	the concentration of attention or energy on something
the concentration of attention or energy on something