primary tooth vs deciduous tooth

primary tooth and deciduous tooth both are nouns.

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

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

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

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

primary tooth (noun)	deciduous 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)