Subtitle
Subheading
noun
ふくだい
副題 (ふくだい) Subtitle, Subheading
副大統領 (ふくだいとうりょう) Vice President
字幕 (じまく) Subtitles
副題 does NOT mean subtitles on a foreign movie! It means Subheading, i.e. the smaller title/heading underneath the main title/heading.