Bukkit

Tiers are the amplifier of the enchant, as you may call them. Ex, regen 1's tier is 1.

These enchant names are used in /ce enchant <enchantname> <tier>

Regensword

• Enchantment name: regen

Withersword

• Enchantment name: wither

Poisonsword

• Enchantment name: poison

Slowsword

• Enchantment name: slow

Blindsword

• Enchantment name: blind

Nauseasword

• Enchantment name: nausea

Resistancesword

• Enchantment name: resistance

Leechhungersword

• Enchantment name: leechhunger

Speedboots

• Enchantment name: speed

Invisibilitysword

• Enchantment name: invisibility

Strengthhelmet

• Enchantment name: strength