pitcher

This word has two separate origins that just happen to look alike. One sense comes straight from pitch + -er (someone who pitches). The other, meaning a container for liquids, comes from Middle English picher, from Old French pichier/pechier/bichier ("small jug"), from Late Latin or Medieval Latin pīcārium, an alteration of bīcārium — possibly traced back to bacarium, bacar, or Greek βῖκος (bîkos).

The container sense traveled a long chain of small vessel-words across French and Latin before settling into English as a jug for pouring liquid, while the thrower sense simply formed later in English from the verb pitch.

The jug sense is a doublet of beaker — both ultimately trace back to the same Latin/Greek vessel-word, just through different paths.