Heteronyms

Heteronym (noun): a word spelled the same as another but having a different sound and meaning, as lead [liːd] (to conduct) and lead [led] (a metal).

Here you have some examples

Present

(Verb) [prɪˈzent] to bring, offer, or give, often in a formal or ceremonious way: to present one's card. 
(Noun) [ˈpreznt] A Gift

Dove
(Noun) [dʌv] a white Bird
(Verb) [dəʊv]  Past tense to "dive"

Live
(Verb) [lɪv] to have life, as an organism; be alive; be capable of vital functions: all things that live.
(Adverb) [laɪv]{of a radio or television program} at the moment of its happening or being performed; not on tape or by prerecording: a program broadcast live.

Polish
(Verb) [ˈpɒlɪʃ] to make smooth and glossy, especially by rubbing or friction: to polish a brass doorknob. 

(Noun) [ˈpəʊlɪʃ] a Slavic language, the principal language of Poland

Tear
(Verb) [tɛə^r] to rip something apart

(Noun) [tɪə^r] A drop of water from the eye when you are crying