IPA: //ˈbruːdˌmɛə//
KK: /ˈbrudˌmɛr/
A female horse that is kept for the purpose of breeding other horses.
The farmer decided to buy a new broodmare to improve the quality of his horse stock.
Broodmare is formed from "brood" (from Old English "brōd", meaning to produce or bear) and "mare" (from Old English "mære", meaning a female horse). The term refers to a female horse that is kept for breeding purposes, specifically for producing offspring.
Think of a 'brood' as producing young and a 'mare' as a female horse — together, they describe a horse that produces young.
No commonly confused words.