These are interesting words sometimes called autantonyms, contranyms or Janus words. There are other names for them as well. There are many.Cleave (to cut, or to cling to)Oversight (Responsibility...
beginning, commencement, first, outset, get-go, start, kickoff, starting time, showtime, offset
plain, dingy, dusty
try, try out, taste
An antonym for 'help' is hinder.