superbad
supervillian
persistent
unfit
See the related link for a list with OVER 1,500 words starting with the prefix IN.
There is no by- prefix. Perhaps what was mean was be-. Some words starting with this are because, belittle, berate, etc.
Words starting with pre - (prefix):precursorprejudgepreludepremedpremixprenatalprenuptialpresortpresumepreteenWords beginning with pre, (not a prefix):preachpreenpresspressure
superwoman,superscipt,
gftgdvgvtrvyyftfty
kelosomia
supernatural, supermarket, superintendent
superintendent, supermarket, superhighway, and supersede. superficial
sexism sexist sexy sexual
supercool superhot supercold supersticious superact superreal superlie