What Words that start with the same letter twice like llama?

You're looking for words with geminates, which are words with two of the same letter in a row. Here are a few examples:

Common Words:

* All

* Ann

* Assess

* Buzz

* Call

* Droll

* Eerie

* Fiddle

* Glasses

* Happy

* Hollow

* Kiss

* Level

* Mass

* Miss

* Odd

* Pass

* Press

* Race

* Really

* Smell

* Still

* Trolley

* Whistle

* Zipper

Less Common Words:

* Aggression

* Ailing

* Bellow

* Boggle

* Cooing

* Crook

* Dappled

* Effervescent

* Flaccid

* Glimmer

* Illustrious

* Jettison

* Kooky

* Lullaby

* Mellow

* Nook

* Oppression

* Pitter-patter

* Quibble

* Rattle

* Sizzling

* Tantalize

* Umbrella

* Vindictive

* Waddle

* Xylophone

* Yonder

* Zippy

And some fun ones:

* Bookkeeper

* Mississippi

* Sassafras

* Woolly (has a double 'l' sound, though it is only written once)

This is just a small sample. You can find more words with geminates by looking in a dictionary or by using online resources.