The best replacement for tags is categories.

The best alternatives to tags are rated as following:
★★★★★  categories
★★★★  warts
★★★★  keywords
★★★  folders
★★  moles
★★  labels
★★  categories wordpress
★★  branches
★★  genital warts
★  categories seo
★  hierarchy
★  taxonomy
★  tables
★  badges
★  notebooks evernote
★  codes
★  branches svn
★  hpv
★  taxonomy drupal
★  skin cancer
★  keywords wordpress
  qr codes
  branches subversion
  barcodes
  notebooks
  categories squarespace
  hemorrhoids
  key words
  labels mavericks
  program tags
  anal warts
  meta tags
  pits
  title tags
  license plates

Your alternative for tags is not listed? Suggest!
Speaking about tags, one probably shouldn't forget about closing tags.

Other search terms related to tags and their ratings are:
★★★★★ closing tags
★★ most likes
★★ elastic bands
★ likes
★ wire ties
You have in mind a companion for tags and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of tags in all years. Click on graph for more.
tags
categories
warts