playing vs golfing

playing and golfing both are nouns.

Word	Noun	Adjective	Verb	Adverb
playing	Yes	No	No	No
golfing	Yes	No	No	No

As nouns, golfing is a hyponym of playing; that is, golfing is a word with a more specific, narrower meaning than playing:

Other hyponyms of playing include bowling, catching, pitching, cheesing.

playing (noun)	golfing (noun)
the action of taking part in a game or sport or other recreation	playing golf
the act of playing a musical instrument
the performance of a part or role in a drama