age bracket vs cohort

age bracket and cohort both are nouns.

Word	Noun	Adjective	Verb	Adverb
age bracket	Yes	No	No	No
cohort	Yes	No	No	No

As nouns, age bracket and cohort are synonyms defined as:

age bracket and cohort: a group of people having approximately the same age

Other synonyms of age bracket include age group.

age bracket (noun)	cohort (noun)
a group of people having approximately the same age	a band of warriors (originally a unit of a Roman Legion)
	a company of companions or supporters
	a group of people having approximately the same age