baseball team vs third base

baseball team and third base both are nouns.

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

baseball team (noun)	third base (noun)
a team that plays baseball	the fielding position of the player on a baseball team who is stationed near the third of the bases in the infield (counting counterclockwise from home plate)
	the base that must be touched third by a base runner in baseball