Here are all of the words I found in the dictionary file, using a filter that only allowed words which could be spelled in hexadecimal:
Ababa
Abba
Abe
Ada
Beebe
DEC
Dacca
Dada
Dade
De
Decca
Dee
Ed
Fe
abbe
abed
accede
acceded
ace
ad
add
added
babe
bad
bade
be
bead
beaded
bed
bedded
bee
beef
beefed
cab
cafe
cede
ceded
dad
dead
deaf
decade
deed
deeded
deface
ebb
facade
facaded
face
faced
fade
faded
fed
fee
feed
Relatedly, programmers often use hex numbers to form words in error codes to make them easier to read, such as "oxDEADBEEF".
