You asked:

what is another word for observe

  • "keep an eye on", "watch over", "watch", "take note" and "respect", among others, are synonyms for "observe".
  • "keep an eye on"

  • "watch over"

  • "watch"

  • "take note"

  • "respect"

  • "remark"

  • "notice"

  • "note"

  • "mention"

  • "maintain"