The best replacement for headings is titles.

The best alternatives to headings are rated as following:
★★★★★  titles
★★★★  subheadings
★★  headers
★  library of congress

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

Other search terms related to headings and their ratings are:
★★★★★ apa
★★★ apa format
★ apa style
You have in mind a companion for headings and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of headings in all years. Click on graph for more.
headings
titles
subheadings