crownless vs uncrowned

crownless and uncrowned both are adjectives.

Word	Noun	Adjective	Verb	Adverb
crownless	No	Yes	No	No
uncrowned	No	Yes	No	No

As adjectives, crownless and uncrowned are synonyms defined as:

crownless (adjective)	uncrowned (adjective)
not (especially not yet) provided with a crown	not (especially not yet) provided with a crown
	not having an (artificial) crown on a tooth; used especially of molars and bicuspids