focussing vs centering

focussing and centering both are nouns.

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

As nouns, focussing and centering are synonyms defined as:

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

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

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