aboard vs baseball game

aboard is not a noun while baseball game is a noun.

Word	Noun	Adjective	Verb	Adverb
aboard	No	No	No	Yes
baseball game	Yes	No	No	No

aboard (noun)	baseball game (noun)
	a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs

aboard (adverb)	baseball game (adverb)
on first or second or third base
on a ship, train, plane or other vehicle
part of a group
side by side