broadening vs increment

broadening and increment both are nouns.

Word	Noun	Adjective	Verb	Adverb
broadening	Yes	No	No	No
increment	Yes	No	No	No

As nouns, increment is a hypernym of broadening; that is, increment is a word with a broader meaning than broadening:

broadening: an increase in width
increment: a process of becoming larger or longer or more numerous or more important

Other hypernyms of broadening include growth, increase.

broadening (noun)	increment (noun)
the action of making broader	the amount by which something increases
the act of making something wider	a process of becoming larger or longer or more numerous or more important
an increase in width