mamma vs dug

mamma and dug both are nouns.

Word	Noun	Adjective	Verb	Adverb
mamma	Yes	No	No	No
dug	Yes	No	No	No

As nouns, dug is a hyponym of mamma; that is, dug is a word with a more specific, narrower meaning than mamma:

Other hyponyms of mamma include bag, udder, boob, bosom, breast, knocker, tit, titty.

mamma (noun)	dug (noun)
milk-secreting organ of female mammals	an udder or breast or teat
informal terms for a mother