price increase vs increment

price increase and increment both are nouns.

Word	Noun	Adjective	Verb	Adverb
price increase	Yes	No	No	No
increment	Yes	No	No	No

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

Other hypernyms of price increase include increase.

price increase (noun)	increment (noun)
increase in price	the amount by which something increases
	a process of becoming larger or longer or more numerous or more important