isn't /izˈənt/ contraction of is not

• heliotype
• heliotypes
• heliotypic
• heliotypies
• heliotypy
• Heliozoa
• heliozoan
• heliozoic
• helipad
• helipads
• heliport
• heliports
• heliscoop
• heliscoops
• heli-skier
• heli-skiers
• heli-skiing
• helispheric
• helispherical
• helistop
• helistops
• helium
• heliums
• helium speech
• helix