osteosclerosis congenita vs achondroplasia

osteosclerosis congenita and achondroplasia both are nouns.

Word	Noun	Adjective	Verb	Adverb
osteosclerosis congenita	Yes	No	No	No
achondroplasia	Yes	No	No	No

As nouns, osteosclerosis congenita and achondroplasia are synonyms defined as:

osteosclerosis congenita and achondroplasia: an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism

Other synonyms of osteosclerosis congenita include achondroplasty, chondrodystrophy.

osteosclerosis congenita (noun)	achondroplasia (noun)
an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism	an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism