There is no by- prefix. Perhaps what was mean was be-. Some words starting with this are because, belittle, berate, etc.
Yes, there are words with the prefix "or." For example, "order," "organize," and "oracle" are some common words that contain the prefix "or."
Words with the prefix -im:immaterialimmatureimmobileimmortalimpartialimperfectimpossibleimpracticalimproperWords with the prefix -in:inaccurateinactiveincalculableincapableincapacitateinconceivableindescribableindiscriminateindivisibleineffectiveingrowninvisibleinvoluntary
Words with the prefix ag:AgricultureAgeAghastAgentAgonizeAglowAgileAgapes
Some words with the prefix 'en' are:enableenamoredencapsulateenchantencyclopediaencodeendureenergyengageenhanceenigmaenjoinenjoyenlargeenlightenennobleenrollensembleensureenterpriseentertainentityentourageentranceenunciateenvelope
Some words with 'dis' prefix are:disasterdisbursediscarddisdaindiseasedisfavordisgustdisheartendisintegratedisjointeddislikedismaydisorganizeddisplaydisquietdisruptdissectdisturbdisuseddisyllabic
Words with the prefix in:inaccurateinfallibleinflexibleinsatiableinsincereintolerantinvaluable
Words that start with the prefix holy include:holystoneholydayholytide
Words start with a prefix and end with a suffix.
Some words that have the prefix 'vit' are:vitalvitalisevitalityvitaminvitreousvitriolvitriolicvitaevittlesvituperate
Some words with the prefix "mas" include mass, master, and mascara.
Words that start with the prefix af:AfroAffairAfterAfghanAfoulAfraidAffordAforeAfootAffirm
Words that begin with the prefix "ie" include "ielectric," "iefficient," and "iempower."