Here are some 6 letter words that start with by:
1)Bypass
2)Bygone
3)Bombyx
4) Byline
5)Bypath
6)Byroad
6 Letter word starts with A is "Africa".
apples
TroutThoughTeasedThirstTanker
NotaryNeatlyNumber
Inact
varied
· afraid
insist
Forest
giving
Killer
incubi