Four letter words starting with B and ending with W are blew, blow, brow, and brew.
Some four letter words starting with S and ending with F are:selfserfsurf
herb.
sayssawsseesspys
abedbleddeedfledfeedheedneedpeedpledreedseedsledteedtredusedweedIit says "starting with "ed", not ending in it.EDIT
Four letter words starting with B and ending with W are blew, blow, brow, and brew.
Some four letter words starting with S and ending with F are:selfserfsurf
ecru
Urdu, unau
each
Answer:FirmFormFromFarmFoamFlam
herb.
Some four letter words starting with A are:ableacreafarajaralsoaltoareaAsiaautoaxle
* alas * axis
sayssawsseesspys
abedbleddeedfledfeedheedneedpeedpledreedseedsledteedtredusedweedIit says "starting with "ed", not ending in it.EDIT
zapp