photism /fōˈti-zm/

1. A hallucinatory vision of light
2. A visual sensation that results from the experience of hearing, feeling, tasting, smelling or thinking something

• back numbers
• back of
• back off
• back-office
• back-of-the-envelope
• back on one's heels
• back out
• backpack
• backpacked
• backpacker
• backpackers
• backpacking
• backpackings
• backpacks
• back pass
• back passage
• back passages
• back passes
• back pay
• back-pedal
• back-pedalled
• back-pedalling
• back-pedals
• backpiece
• backpieces