The opposite of heir is heiress. Heir is the male beneficiary while a heiress refers to a female who is to inherit wealth.
The opposite of "heir" is "disinheritance" or "disinherited person," as an heir is someone who is legally entitled to inherit property or assets from a predecessor. In a broader sense, "heir" implies a continuation or succession, while its opposite would suggest a lack of succession or entitlement.
The noun for a male is an heir; the noun for a female is an heiress.
heiress
heir
Heiress.
Do you mean testator? If an heir receives a bequest, the testator is the person that gives the bequest to him/her.
the female is an heiress
The opposite of "heir" is "disinherit" or "disinheritance," which refers to the act of preventing someone from receiving an inheritance. While an heir is someone designated to receive property or assets upon another's death, a disinherited person is excluded from that right. Additionally, a more general opposite could be "benefactor," as it refers to someone who gives or provides rather than receives.
heir/air (NOT hair!)
the homophone for heir is air
"Heir to heir" in a will means that a person is designated as the beneficiary or inheritor of assets who, in turn, designates another person as their beneficiary or inheritor. It establishes a succession plan for the assets to pass from one designated person to another.
A person who inherits possessions is called an heir. The word heir is a noun. Some synonyms for heir are beneficiary, grantee, inheritor, and successor.