HEREUPON is a playable word

hereupon Scrabble® Dictionary

adverb
immediately following this
111 Playable Words can be made from "HEREUPON"
   2-Letter Words (19 found)
   5-Letter Words (13 found)
   6-Letter Words (7 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)