golf club (equipment)
Only with reading ゴルフクラブ
Refers to the stick used to hit a golf ball. In Japanese, this is almost always written in katakana.
I bought a new golf club.
golf club (organization)
Refers to a golfing organization or its facilities. The kanji spelling ゴルフ倶楽部 is rare and mostly historical or formal.
He joined the local golf club.