Breeder is a 7 letter words using only those letters
There is no 7-letter word available with those letters, the longest words are these 6-letter words:garveygreaveraggeeregavereggae
There is no English word that uses all 7 of these letters. The longest word using these letters in unreel. The longest word using the j is jurel.
There are three 7-letter words possible:roosterrooterstoreros
Using all 7 letters you get rewords
snowday
sultana
There is no 7-letter word using these letters, but there are these two 6-letter words:adroitdiatom
Endmost.
spiders
sextant
precess