The Proto-Indo-European word *h₃owi- (nom. h₃owi-s, gen. h₃ewy-ós)
Word *h₃owi- (nom. h₃owi-s, gen. h₃ewy-ós)
Meaning sheep
Synonyms *h₁eri-, *h₂ówis, *moisós, *(s)k̂egos

Comments
Russ. ovca, Lith. avis, Ltv. avs, Skr. avika, Eng. ēowu/ewe, Gm. ouwi/Aue, Goth. awēþi, ON ǽr, Gk. ois, Ir. ói/, Hitt. ḫ awi, Luw. ḫ āwi-, Welsh ewig, Toch. --/āuw, Arm. hoviv, Polish owca, Lat. ovis, Umbrian uvem, Old Prussian awins, Lyc. xabwa

Other words that might be of interest
*dhóhaus ‘to press, wolf’, *dhau-kos ‘wolf’, *gʷōus ‘cow, bull’, *ghaidos ‘goat’, *h₁eperos ‘boar’, *h₁er- ‘goat’, *h₁ék̂wos ‘horse’, *h₂ŕ̥tk̂os ‘bear’, *hₐegʷhnos ‘lamb’, *hₐeiĝs ‘goat’, *k̂won- (nom. k̂wōn, gen. k̂un-ós) ‘dog’, *kapro- ‘goat’, *leh₃p- ‘cow’, *márkos ‘horse’, *suh₁- ‘swine, pig’, *wlkʷ-o- ‘wolf’, *díks ‘goat’, *h₁eĝh- ‘cow’, *koĝhéhₐ- ‘goat’, *tauros ‘aurochs, bull’, *twork̂ós ‘boar’, *uk(w)sēn- ‘ox’, *wok̂éhₐ- ‘cow’, *(y)ebʰ- ‘elephant’, *wr̥h₁ēn ‘lamb’, *k̂(u)wōn ‘dog’, *li(w)- ‘lion’, *lohapo- ‘cow’, *mendyos ‘horse’, *perd- ‘lion, panther’, *ĝhéyos ‘horse’, *wailos ‘wolf’, *wl̥kʷos ‘wolf’