literati
There is no 8-letter word, but there are several 7-letter words:agnaticanticarcartingcratinggranitatracing
You can get the word pyramids from those letters.
testiest
sextets
The letters spell the word audience. It is an 8 letter word.
Increase and illusion begin with and I and are 8 letters.
"Hazelnut"
Laughter
humanhey
"Gambling" is an eight letter word.
The word is folktale.
An 8 letter word out of methematician is "thematic." It is straightforward, and requires no rearrangement of letters.