mammary gland vs mamma

mammary gland and mamma both are nouns.

Word	Noun	Adjective	Verb	Adverb
mammary gland	Yes	No	No	No
mamma	Yes	No	No	No

As nouns, mammary gland and mamma are synonyms defined as:

mammary gland (noun)	mamma (noun)
milk-secreting organ of female mammals	milk-secreting organ of female mammals
	informal terms for a mother