baby tooth vs milk tooth

baby tooth and milk tooth both are nouns.

Word	Noun	Adjective	Verb	Adverb
baby tooth	Yes	No	No	No
milk tooth	Yes	No	No	No

As nouns, baby tooth and milk tooth are synonyms defined as:

baby tooth and milk tooth: one of the first temporary teeth of a young mammal (one of 20 in children)

Other synonyms of baby tooth include deciduous tooth, primary tooth.

baby tooth (noun)	milk tooth (noun)
one of the first temporary teeth of a young mammal (one of 20 in children)	one of the first temporary teeth of a young mammal (one of 20 in children)