As adjectives the difference between hep and helpful
is that hep is (dated|us slang) aware, up-to-date while helpful is furnishing help; giving aid; useful.
As a noun hep
is (obsolete) a hip of a rose; a rosehip.
helpful
English
Alternative forms
* helpfull (archaic)
Adjective
(
en adjective)
Furnishing help; giving aid; useful.
See also
* helpfully
* helpfulness