Geruverrda, you aren't using Word Spells correctly. That Fire Burst Word effect has a max of 10d6, it doesn't matter if you have a 20 Caster Level. You can raise the total damage dice only to 15d6 with Intensify Spell. If you have more than one damaging Word in the spell, you don't add another 10d6, or 5d6. Word casters at level 11 don't do 25d6 with one 6th level spell, while other level 11 casters that aren't Word Casters are only doing 11d6 with a 6th level spell like Chain Lightning. Ask your GM and even ask the other players you're with if your base damage is over double what any other caster can do (with no build involved) sounds reasonable to them.
Is the DM going to give you exactly all these specific magic items, whenever you get the gold to afford them? That ioun stone is 30k, the Prayer Beads are 45k. I hope your DM gives you tons of gold/treasure as you level.
The Otherwordly Kimono adds to Caster Level checks, not to the Caster Level of all your spells. That doesn't add to your damage, it helps you get past things like Spell Resistance, or when someone tries to Dispel your spells.
You also need to check with the GM if you can use Word Casting with feats/traits that say you have to pick a specific spell, like Spell Specialization and Spell Perfection. A Word like Fire Burst can be seen as a specific spell, but when you combine it with other Words it changes to a different spell. A specific combination of Words can probably be used as one specific spell.