The Proto-Indo-European word *hₐekkehₐ-
Word *hₐekkehₐ-
Meaning mother
Synonyms *méhₐtēr, *h₄em-, *h₄en-, *m-h₄em-, *n-h₄en-, *ĝenh₁trihₐ-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*bʰréhater- ‘brother’, *ĝ(e)lōu̯- ‘sister in law’, *gʷénha ‘woman, wife’, *i̯énǝter- ‘husband’s brother’s wife’, *aner-, ner- ‘man, vital energy’, *awo- ‘grandfather, adult male relative other than one's father’, *deh₂iwer- ‘husband's brother’, *dhuĝ(hₐ)tḗr ‘daughter’, *ĝh₂lōu- ‘brother's wife’, *h₂en- ‘ancestor’, *népot- (nom. népōt-s gen. nept-ós) ‘grandson/nephew’, *ph̥atḗr ‘father’, *snúso- ‘daughter-in-law’, *swésōr ‘sister’, *yenh₂ter- ‘brother-in-law's wife’, *wihₓrós ‘husband, man, freeman’, *at- ‘father’, *dheh₁- ‘uncle’, *h₂euh₂os ‘uncle, grandfather’, *h₂/₃orbʰos ‘orphan, heir’, *h₂/₃wed(h₂)- ‘lead in marriage, marry’, *hₐnḗr ‘man, person’, *t-at- ‘father’, *wersēn ‘male’, *manu- ‘man, ancestor of humankind’, *népōts ‘grandson, nephew’, *papa ‘father, papa’, *pótis ‘husband’, *r̥sḗn ‘male’, *sm̥-loghos ‘spouse’, *sneubʰ- ‘marry’, *swék̂uros ‘father-in-law’, *bʰrehatríyom ‘brotherhood’, *dhĝhm̥ón- ‘man’, *ĝénh₁es- ‘family’, *ĝenh₁tōr ‘father, procreator’, *mr̥tós ‘dead, mortal’, *mórtos ‘person, mortal, man’, *neptihₐ- ‘granddaughter, (?) niece’, *neptiyos ‘descendant’, *putlós ‘son’, *potnihₐ- ‘mistress, lady, wife’, *prihₓehₐ ‘wife’, *suhₓsos ‘grandfather’, *suhₓyús ‘son’, *suhₓnús ‘son’, *swek̂rúhas ‘mother-in-law’, *teknom ‘child, offspring’, *widhewehₐ ‘widow’