diamond vs ball field

diamond and ball field both are nouns.

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

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

Other synonyms of diamond include baseball field.

diamond (noun)	ball field (noun)
the area of a baseball field that is enclosed by 3 bases and home plate	the baseball playing field
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