deciduous tooth vs primary tooth

deciduous tooth and primary tooth both are nouns.

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

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

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

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

deciduous tooth (noun)	primary 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)