Seven letter words using the letters PESOLCTCYLTNEBLPIUTA are:
PATIENT
ELASTIC
SECTION
OUTCAST
LETTUCE
CONTEST
TYPICAL
CALYPSO
LULLABY
TOENAIL
NOTABLE
ECLIPSE
BECAUSE
LACTOSE
PLASTIC
INSPECT
UTENSIL
TACTICS
ACCOUNT
outside
You can make two 7 letter words : COSTARS and CASTORS
chrisms
laminae
Wiriest
netball
choanae
stammer
Demented
lidless
Germany
No 7 letter words, the longest is 6 letters, purist