背景【はいけい】
background, scenery, backdrop, setting, background (of an incident, situation, etc.), circumstances, context, backing, support (from behind the scenes)
背中【せなか】
back (of the body)
背広【せびろ】
business suit
背骨【せぼね】
spine, backbone, spinal column
背信【はいしん】
betrayal, infidelity
背丈【せたけ】
stature, height
背負う【せおう】
to carry on one's back, to be burdened with, to take responsibility for, to have (something) in the background, to be in front (of something), to be conceited, to think highly of oneself