I haven't had my coffee yet. Make up your own damn mnemonic. Grr.
Northerners like Norwegians are taller than Japanese because of their long backs - and a back is an organ of the body.
height. (NUBI) You gotta say like 背が高い! or 背が低い!
background (both in the sense of the background of a photo, and the background context of a story)
small of the back
carry on back
せお＊う： lit： to carry on one's back. Figuratively, to assume the burden of.