Heroin is a drug. Heroine is the principal female character in a novel, poem, or drama. It can also refer to a woman noted for courage, daring action, or special achievement.
Difference between Heritage and Hermitage
Heritage refers to inherited property, status acquired through birth, or a tradition. Hermitage refers to a place where one can live in seclusion (an abbey or monastery).
Difference between Herein and Herewith
Both Herein and Herewith are business jargon and should be avoided in writing.