The best replacement for caption is subtitle.

The best alternatives to caption are rated as following:
★★★★★  subtitle
★★★★★  label
★★  title
★★  subtitles
★  closed caption
★  open caption
★  cutline
  figure legend

Your alternative for caption is not listed? Suggest!
Speaking about caption, one probably shouldn't forget about tabular latex.

Other search terms related to caption and their ratings are:
★★★★★ tabular latex
★★★★★ image html
★★★★ includegraphics
★★★★ slider jquery
★★★★ label latex
★★★ figure
★★ photo
★★ picture
★★ figure word
★ figure latex
theater
You have in mind a companion for caption and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of caption in all years. Click on graph for more.
caption
subtitle
label