Two groups of words

What's the hidden rule of the two groups?

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I'm fairly certain I have the first group right but I'm less sure with the second.

First Group:

Each word has run of 3 letters in alphabetical order. Airstream, Almner, Astute, Deflation, Hijack, Acetaminophen, Laughing.

Second Group:

Each word has a consonant digraph (two letters that spell one sound). Psoriasis, Pushed, Patched, Knifed, Hijack, Acetaminophen, Laughing.

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  • $\begingroup$ I spotted the second but not the first, well done $\endgroup$ – AHKieran Nov 7 '18 at 16:17
  • $\begingroup$ If so, what about the 'ea' in airstream and the 'ti' in deflation? $\endgroup$ – kanoo Nov 7 '18 at 17:49
  • $\begingroup$ He said CONSONANT digraph $\endgroup$ – Chris Cudmore Nov 7 '18 at 17:51
  • $\begingroup$ [insert expletive indicating the realization of my error here] $\endgroup$ – kanoo Nov 7 '18 at 17:56

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