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hitch ethic
forehead
herbivore
homestead
gopher
Home H-O-M-E sweet H-O-M-E
In English the largest word you can make is woaded, which uses six of the seven letters. There are no valid seven-letter combinations from the pattern a d d e h o w.
There is no single English word that meets the criteria.
Chamomile.
It is spelt hole.
preschool
The only 5 letter word is 'phone'