There is no seven letter word, but there are these 6-letter words:
dieses
easies
ecesis
egises
emeses
emesis
espies
lessee
peises
resees
seines
seised
seiser
seises
seizes
sensei
series
sieges
sieves
sirees
speise
repaper
A seven letter word starting with R and ending with O is risotto.
Streaky
seceded
seven letter word that can be made from the word technology: cologne. ecology. neology.
You've provided only 5 letters, but even with 2 blank tiles you can't make a 7-letter word.
unnethe (Chaucer)
stencil
seesaw
prairie
Sites
Gestapo