incubus /inˈ or ingˈkū-bəs/

1. A devil supposed to assume a male body and have sexual intercourse with women in their sleep (cf succubus)
2. A nightmare
3. Any oppressive person, thing or influence

• underselves
• undersense
• undersenses
• under separate cover
• underserved
• underset
• undersets
• undersetting
• undersexed
• undershapen
• under-shepherd
• under-shepherds
• under-sheriff
• undersheriff
• undersheriffs
• undershirt
• undershirts
• undershoot
• undershooting
• undershoots
• undershorts
• undershot
• undershrub
• undershrubs
• underside