anterior vs front tooth

anterior and front tooth both are nouns.

Word	Noun	Adjective	Verb	Adverb
anterior	Yes	Yes	No	No
front tooth	Yes	No	No	No

As nouns, anterior and front tooth are synonyms defined as:

anterior (noun)	front tooth (noun)
a tooth situated at the front of the mouth	a tooth situated at the front of the mouth

anterior (adjective)	front tooth (adjective)
of or near the head end or toward the front plane of a body
earlier in time