The best replacement for nook hd is kindle fire hd.

The best alternatives to nook hd are rated as following:
★★★★★  kindle fire hd
★★★  nexus 7
★★★  ipad mini
★★  nook hd+
★★  kindle fire hdx
★★  nook color
★★  kindle hd
★★  kindle fire
★★  nook hd plus
★  kindle
★  kindle fire hd 2013
★  nook glowlight
★  nook tablet
★  nexus 7 2013
★  hd plus
  samsung galaxy tab 2
  kobo arc
  hudl
  nexus 7 2012
  kindle hdx
  kindle fire which is better
  galaxy tab 3
  google nexus 7
  ipod mini
  fire hd

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Speaking about nook hd, one probably shouldn't forget about kindle hd.

Other search terms related to nook hd and their ratings are:
★★★★★ kindle hd
★★ adobe digital editions
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Google Trends

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nook hd
kindle fire hd
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