gerbil
There are no 8 letter words in the English language that include letters RLL as the 5th, 6th and 7th letters.
The school subject you're looking for is "History." It has 8 letters, and the 5th letter is "l."
automobilesdenominatordocumentarysnowmobilesthermometer
engagement
CrittersThe Sting
The 5th letter is e. The 6th letter is r.
accessed, embedded, annulled
pee
Acute
package, massage, passage
QUININA
friend