two or more words derive from the same source; cognate

father

same

a fountainhead (source of a river) / a source, origin

talk, speak / word, language, term / Short for 物語 (monogatari): story, tale, narrative

a surname, especially those who are descendants of Emperor Saga

a source, origin

fountainhead / source, origin / Short for 源氏 (Genji): Minamoto clan

source / origin / root

father / (by extension, figuratively) a father figure (male initiator or founder of something) / (Christianity) God, the Holy Father