HEIR – [1] a person who inherits or is entitled by law or by the terms of a will to inherit the estate of another; [2] a person who succeeds or is in line to succeed to a hereditary rank, title, or office
Merriam-Webster Online Dictionary
heir (noun)1.
one who inherits or is entitled to inherit property
2.
one who inherits or is entitled to succeed to a hereditary rank, title, or office - heir to the throne
3.
one who receives or is entitled to receive some endowment or quality from a parent or predecessor
transitive verb
chiefly dialect - inherit