fair ball vs physical contact

fair ball and physical contact both are nouns.

Word	Noun	Adjective	Verb	Adverb
fair ball	Yes	No	No	No
physical contact	Yes	No	No	No

As nouns, physical contact is a hypernym of fair ball; that is, physical contact is a word with a broader meaning than fair ball:

fair ball: (baseball) a ball struck with the bat so that it stays between the lines (the foul lines) that define the width of the playing field
physical contact: the act of touching physically

Other hypernyms of fair ball include contact.

fair ball (noun)	physical contact (noun)
(baseball) a ball struck with the bat so that it stays between the lines (the foul lines) that define the width of the playing field	the act of touching physically