The Proto-Indo-European word *h₁ék̂wos
Word *h₁ék̂wos
Meaning horse
See also Homeric Greek: ἵππος ‘horse’
Linear B: i-qo ‘horse’
Sanskrit: aśvaḥ ‘horse’
Cappadocian Greek: έθιο ‘horse’
Thracian: esvas ‘horse’
Greek: Ίππος ‘horse’
Latin: equus ‘horse’
Old Persian: a-sa-pa ‘horse’
Old Norse: *ehwaz ‘horse’
Hittite: ekku ‘horse’
C. Luwian: az-zu-wa- ‘horse’
Proto-Anatolian: *ʔeku- ‘horse’
Mitanni: ašwa ‘horse’
Proto-Indo-European: *h₁ék̂wehₐ ‘mare’
Lycian: esbe ‘horse’
Ancient Macedonian: ἵππος ‘horse’
Synonyms *márkos, *mendyos, *ĝhéyos

Comments
Lat. equus, Toch. yuk/yakwe, Gaul. epos, Gk. hippos, Skr. aśva, Av. asva-, Lith. ašva, Old Prussian aswinan, Kamviri ušpa, Eng. eoh/--, Gm. ehwaz/--, Goth. aiƕ tundi, ON iór, Hitt. aśuwas, Arm. ēš, Welsh ebol, Ir. ech/each, Thrac. esvas, Lyc. esbe-, Phryg. es', Pers. aspa/asb, Osset. jæfs/æfsæ, Venetic ekvon

Other words that might be of interest
*dhóhaus ‘to press, wolf’, *dhau-kos ‘wolf’, *gʷōus ‘cow, bull’, *ghaidos ‘goat’, *h₁eperos ‘boar’, *h₁er- ‘goat’, *h₂ŕ̥tk̂os ‘bear’, *hₐegʷhnos ‘lamb’, *hₐeiĝs ‘goat’, *h₃owi- (nom. h₃owi-s, gen. h₃ewy-ós) ‘sheep’, *k̂won- (nom. k̂wōn, gen. k̂un-ós) ‘dog’, *kapro- ‘goat’, *leh₃p- ‘cow’, *suh₁- ‘swine, pig’, *wlkʷ-o- ‘wolf’, *díks ‘goat’, *h₁eĝh- ‘cow’, *h₁eri- ‘sheep, goat’, *h₂ówis ‘sheep’, *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’, *moisós ‘sheep, ram, fleece, skin’, *perd- ‘lion, panther’, *(s)k̂egos ‘sheep, goat’, *wailos ‘wolf’, *wl̥kʷos ‘wolf’