primary tooth vs baby tooth

primary tooth and baby tooth both are nouns.

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

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

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

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

primary tooth (noun)	baby 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)