What's the hidden rule of the two groups?
I'm fairly certain I have the first group right but I'm less sure with the second.
Each word has run of 3 letters in alphabetical order. Airstream, Almner, Astute, Deflation, Hijack, Acetaminophen, Laughing.
Each word has a consonant digraph (two letters that spell one sound). Psoriasis, Pushed, Patched, Knifed, Hijack, Acetaminophen, Laughing.