first base vs baseball team

first base and baseball team both are nouns.

Word	Noun	Adjective	Verb	Adverb
first base	Yes	No	No	No
baseball team	Yes	No	No	No

first base (noun)	baseball team (noun)
the initial stage in accomplishing something	a team that plays baseball
the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate)
the base that must be touched first by a base runner in baseball