basically, they're the same thing. winx club is a show, and enchantix is just one of their fairy forms.
Winx Club Enchantix - 2011 The Water Stars was released on: USA: 21 December 2011
Winx Club Enchantix - 2011 Love Problems 5-20 was released on: USA: 2011
Winx Club Enchantix - 2011 Building Hope 3-16 was released on: USA: 12 December 2011
Winx Club Enchantix - 2011 Valtor's Plan 3-2 was released on: USA: 15 November 2011
Winx Club Enchantix - 2011 The Pixies' Charge 3-20 was released on: USA: 1 January 2011
Winx Club Enchantix - 2011 was released on: USA: 2011
Winx Club Enchantix - 2011 Winx Believix 4-7 was released on: USA: 2011
Winx Club Enchantix - 2011 The Winx Club Premiere Special 1-1 was released on: USA: 27 June 2011
From the magical powers they have.
Winx Club Enchantix - 2011 Nebula 4-9 was released on: USA: 2011
Winx Club Enchantix - 2011 Finding Your Way was released on: USA: 20 December 2011
Winx Club Enchantix - 2011 Journey to Lynphea was released on: USA: 6 December 2011
Winx Club Enchantix - 2011 The Water Stars was released on: USA: 21 December 2011
episode 16
Winx Club Enchantix - 2011 Wizard's Anger 3-25 was released on: USA: 2011
Winx Club Enchantix - 2011 The Sirenix Song 5-8 was released on: USA: 2011
Winx Club Enchantix - 2011 Valtor's Box 3-18 was released on: USA: 2011