ball field vs diamond

ball field and diamond both are nouns.

Word	Noun	Adjective	Verb	Adverb
ball field	Yes	No	No	No
diamond	Yes	No	No	No

As nouns, ball field and diamond are synonyms defined as:

Other synonyms of ball field include baseball field.

ball field (noun)	diamond (noun)
the baseball playing field	the area of a baseball field that is enclosed by 3 bases and home plate
	a playing card in the minor suit that has one or more red rhombuses on it
	the baseball playing field
	a transparent piece of diamond that has been cut and polished and is valued as a precious gem
	a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
	very hard native crystalline carbon valued as a gem