roster vs batting order

roster and batting order both are nouns.

Word	Noun	Adjective	Verb	Adverb
roster	Yes	No	No	No
batting order	Yes	No	No	No

As nouns, batting order is a hyponym of roster; that is, batting order is a word with a more specific, narrower meaning than roster:

roster: a list of names
batting order: (baseball) a list of batters in the order in which they will bat

Other hyponyms of roster include card, lineup, death-roll, muster roll, church roll, rota, waiting list.

roster (noun)	batting order (noun)
a list of names	(baseball) a list of batters in the order in which they will bat