helicon /helˈi-kon or -kən/

A circular bass tuba

• ergograph
• ergographs
• ergomania
• ergomaniac
• ergomaniacs
• ergomanias
• ergometer
• ergometers
• ergon
• ergonomic
• ergonomically
• ergonomics
• ergonomist
• ergonomists
• ergons
• ergophobia
• ergophobias
• ergosterol
• ergosterols
• ergot
• ergotamine
• ergotise
• ergotised
• ergotises
• ergotising