cohort vs age bracket

cohort and age bracket both are nouns.

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

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

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

Other synonyms of cohort include age group.

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