Sentinel is a serif font. It goes well with Ideal Sans, Whitney, Gotham, knox background a, Bodoni, Clarendon, Tungsten, Trade Gothic and DIN. If you're thinking about using Sentinel then try 28px for headers. Give 22px a shot for content.
People commonly tag it as design, portfolio, agency, blog, business, app, tool, elegant, retro and fashion. You can get it from Fonts.com, Fontspring and MyFonts.