linchpin /linchˈ or linshˈpin/

1. A pin used to keep a wheel on its axle
2. A person or thing essential to a plan, organization, etc (figurative)

• Galliano
• galliard
• galliardise
• galliardises
• galliards
• galliass
• galli-bagger
• galli-beggar
• gallic
• Gallic
• gallic acid
• Gallican
• Gallicanism
• lemon geraniums
• lemon grass
• lemonier
• lemoniest
• lemoning
• lemon law
• lemon peel
• lemon peels
• lemons
• lemon sole
• lemon soles
• lemon squash