lutecium/loohʹteeshi·əm/ noun

• bacillus
• back
• backache
• back and forth
• back away
• backbeat
• back bench
• backbite
• backblocks
• backboard
• back boiler
• backbone
• backbreaking
• backchat
• backcloth
• backcomb
• back country
• backdate
• back door
• back down
• back down to earth
• backdrop
• backed
• backfield
• backfill