As proper nouns the difference between mommy and mam
is that mommy is (chiefly|used by young children) one's mother while mam is a mayan language spoken in the mexican state of chiapas and the guatemalan departments of quetzaltenango, huehuetenango, san marcos, and retalhuleu.
mommy
English
Noun
(mommies)
(US, Canada, usually, childish) Mother.
Synonyms
* ma, mama, mamma, mom (qualifier), momma (US), mum (British), mummy (British)
mam
English
Noun
(
en noun)
(informal, and, colloquial) Diminutive of mother.
Usage notes
Used in place of mum or ma in Northumbrian dialects such as Geordie, as well as throughout Ireland and Liverpool.
References
*
*