focal point vs focussing

focal point and focussing both are nouns.

Word	Noun	Adjective	Verb	Adverb
focal point	Yes	No	No	No
focussing	Yes	No	No	No

As nouns, focal point and focussing are synonyms defined as:

focal point and focussing: the concentration of attention or energy on something

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

focal point (noun)	focussing (noun)
the concentration of attention or energy on something	the concentration of attention or energy on something
a point of convergence of light (or other radiation) or a point from which it diverges
a central point or locus of an infection in an organism