6 letter word: E F C O R N

3 letter words
CON
COR
EON
FEN
FOE
FOR
FRO
NOR
ONE
ORC
ORE
REC
REE
ROE

4 letter words
CONE
CORE
CORN
FERN
FORE
ONCE

5 letter words
CRONE
FORCE
RECON

6 letter words
CONFER