The Proto-Indo-European word *h₂ŕ̥tk̂os
Word *h₂ŕ̥tk̂os
Meaning bear
See also Homeric Greek: ἄρκος ‘bear’
Homeric Greek: ἄρκτος ‘bear’

Comments
Gk. arktos, Lat. ursus, Skr. ṛ kṣ a, Pers. /xers, Arm. arj/arč, Gaul. Artioni, Alb. ari, Kamviri ic, Osset. ærs, Welsh arth, Av. aršam, Hitt. ḫ artagga

Other words that might be of interest
*bʰer- ‘to bear, carry’, *dhóhaus ‘to press, wolf’, *ĝhel-1, ĝhelǝ-, ĝhlē- ‘to shine, green, gold’, *dhau-kos ‘wolf’, *ank-2, ang- ‘to bend, bow, curve, snake coil, anchor’, *(s)kr-įe/o- ‘to cut’, *ken-2, kenǝ-, keni-, kenu- ‘to rub, scrape off’, *(s)kerbʰ- ‘to turn, to bend’, *k̂es- ‘to cut, to separate’, *gʷōus ‘cow, bull’, *leig- ‘to bind’, *gēu-, gǝu-, gū- ‘to bend, curl, a kind of vessel’, *bʰruh- ‘beam, bridge’, *deh₁- ‘to bind’, *deuk- ‘to lead’, *dʰeiĝʰ- ‘to mold’, *ĝʰwel- ‘to bend’, *ghaidos ‘goat’, *gʰrendʰ- ‘beam’, *gʷʰen- ‘to press’, *h₁eperos ‘boar’, *h₁er- ‘goat’, *h₁ék̂wos ‘horse’, *hₐegʷisy(e)hₐ- ‘axe’, *hₐegʷhnos ‘lamb’, *hₐeiĝs ‘goat’, *h₃erbʰo- ‘work’, *h₃nógʰ-o- / h₃nógʰ-ro- / h₃nógʰ-i- ‘nail’, *h₃owi- (nom. h₃owi-s, gen. h₃ewy-ós) ‘sheep’, *k̂won- (nom. k̂wōn, gen. k̂un-ós) ‘dog’, *kapro- ‘goat’, *leh₂- ‘to wet, to make flow, to pour, wash’, *leh₃p- ‘cow’, *leib- ‘to make a libation, to pour’, *leuĝ- ‘to break off, to break’, *márkos ‘horse’, *neigʷ- ‘to wash’, *pleh₂k- ‘to hit’, *reg- ‘move in a straight line, rule, guide’, *resg- ‘to plait’, *skap- ‘tool’, *suh₁- ‘swine, pig’, *tek̂s- ‘to plait’, *treud- ‘to press’, *wlkʷ-o- ‘wolf’, *wedʰ- ‘to lead’, *ag̑- ‘to lead, drive, agitate’, *tom-, tem- ‘to cut’, *kʰʷer-, kʷer- ‘make, form’, *sper- ‘to strew’, *werĝ- ‘to work’, *hₓópes- ‘work’, *bʰei(hₓ)- ‘strike’, *bʰélhaĝs ‘plank, beam’, *bʰer- ‘to strike (through), to split, to cut’, *bʰeud- ‘strike, beat’, *del- ‘to cut, to carve, to split’, *dephₓ- ‘strike’, *derha- ‘work’, *díks ‘goat’, *dhúbʰos ‘wedge, peg’, *gem- ‘to press, to squeeze together, to squeeze’, *gloiwos ‘clay’, *ĝheu- ‘to pour’, *h₁eĝh- ‘cow’, *h₁erhₓ- ‘to wash’, *h₁eri- ‘sheep, goat’, *h₁ekt- ‘net’, *h₂ówis ‘sheep’, *h₄edhés- ‘axe, adze’, *hₐeyes- ‘metal, copper, bronze’, *kehau- ‘strike, hew’, *kel- ‘drive’, *kel- ‘hew, strike’, *kérdos ‘craft’, *khaónks ‘honey-coloured, golden’, *koĝhéhₐ- ‘goat’, *kon- ‘to do, to make’, *tauros ‘aurochs, bull’, *tkʷreh₁yot- ‘clay’, *tk̂en- ‘strike’, *twork̂ós ‘boar’, *uk(w)sēn- ‘ox’, *wēben ‘cutting weapon, knife’, *wedh- ‘strike, push’, *wen- ‘strike, wound’, *w(n̥)nákts ‘leader, lord’, *wok̂éhₐ- ‘cow’, *(y)ebʰ- ‘elephant’, *yeh₁- ‘to make, to do, to act vigorously’, *yeu- ‘to bind, to join together’, *wreg- ‘to press, to oppress’, *wreh₁ĝ- ‘to break, to tear to pieces’, *wr̥h₁ēn ‘lamb’, *wórghs ‘row, chain, series’, *kreu(-s)- ‘strike’, *kseu- ‘to rub, to whet’, *k̂emha- ‘to grow tired, to tire oneself with work, to work’, *kʷei- ‘to pile up, to build’, *k̂(u)wōn ‘dog’, *kʷer- ‘to make, to do, to build’, *leng- ‘to bend’, *lenk- ‘to divide, to bend, to traverse’, *li(w)- ‘lion’, *lohapo- ‘cow’, *mendyos ‘horse’, *merd- ‘to rub, to scrape’, *moisós ‘sheep, ram, fleece, skin’, *neihₓ- ‘lead’, *per- ‘strike’, *perd- ‘lion, panther’, *pelek̂us ‘axe’, *pyek- ‘strike’, *silVbVr- ‘silver’, *skéits ‘shield, board’, *(s)k̂egos ‘sheep, goat’, *slak- ‘strike’, *steup- ‘strike’, *swel-~sel- ‘plank, board’, *kl̥tḗr ‘knife’, *kreb- ‘basket’, *bʰreu- ‘to cut, to break up’, *ĝhéyos ‘horse’, *h₂erĝn̥tom ‘silver, white (metal)’, *hₐeĝós ‘leader’, *hₐeusom ‘gold’, *kert- ‘knife’, *k̂ostrom~k̂osdhrom ‘knife’, *koryonos ‘leader’, *kʷr̥wis ‘tool’, *ml̥dho/ehₐ- ‘clay’, *(s)kel- ‘to cut, to split apart’, *sekūr- ‘axe’, *tagós ‘leader’, *tek̂so/ehₐ ‘adze, axe’, *ter(i)- ‘to turn, to rub’, *wailos ‘wolf’, *wl̥kʷos ‘wolf’