Nouns

(n)sirea title of address formerly used for a man of rank and authority
(n)forefather, father, sirethe founder of a family“keep the faith of our forefathers”
(n)siremale parent of an animal especially a domestic animal such as a horse

Verbs

(v)beget, get, engender, father, mother, sire, generate, bring forthmake (offspring) by reproduction“Abraham begot Isaac”, “John fathered four daughters”