diamond vs playing area

diamond and playing area both are nouns.

Word	Noun	Adjective	Verb	Adverb
diamond	Yes	No	No	No
playing area	Yes	No	No	No

As nouns, playing area is a hypernym of diamond; that is, playing area is a word with a broader meaning than diamond:

Other hypernyms of diamond include athletic field, field, playing field.

diamond (noun)	playing area (noun)
the area of a baseball field that is enclosed by 3 bases and home plate	a piece of land prepared for playing a game
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