An Ally

1. One united to another by treaty or league; — usually applied to sovereigns or states; a confederate.
2. Anything associated with another as a helper; an auxiliary.
3. Anything akin to something else by structure, etc.
4. (taxonomy) A closely related species, usually within the same family.
5. (specifically) A person who is not a member of the LGBT+ community but is supportive of it.
6. (obsolete) A relative; a kinsman.