As adjectives the difference between efficient and ultraefficient

is that efficient is efficient while ultraefficient is extremely efficient; of utmost efficiency.

As adjectives the difference between catholic and xavierian

is that catholic is of the western christian church, as differentiated from eg the orthodox church while xavierian is pertaining or related to this religious order.

As nouns the difference between catholic and xavierian

is that catholic is a member of a catholic church while xavierian is a member of the , a religious order founded in 1839 and dedicated to catholic education in the united states.

As nouns the difference between education and xavierian

is that education is education while xavierian is a member of the , a religious order founded in 1839 and dedicated to catholic education in the united states.

As an adjective xavierian is

pertaining or related to this religious order.

Xenelasia is an alternative form of xenelasy.

As nouns the difference between xenelasia and xenelasy

is that xenelasia is xenelasy while xenelasy is the expulsion of foreigners.

As nouns the difference between expulsion and xenelasy

is that expulsion is expulsion while xenelasy is the expulsion of foreigners.

As nouns the difference between foreigners and xenelasy

is that foreigners is while xenelasy is the expulsion of foreigners.

As a proper noun city

is (uk) a popular shortened form of the city of london, the historic core of london where the roman settlement of londinium was established.

As an adjective xanthian is

of the city (or xanthus) in ancient lycia.

As a noun xanthian is

a citizen of xanthos.

As nouns the difference between citizen and xanthian

is that citizen is a pupil of while xanthian is a citizen of xanthos.

As an adjective xanthian is

of the city (or xanthus) in ancient lycia.

Periodontal is a related term of periodontium.

As an adjective periodontal

is surrounding a tooth.

As a noun periodontium is

the specialized tissues that both surround and support the teeth, maintaining them in the maxillary and mandibular bones; the tissues including alveolar bone, cementum, gums and periodontal ligament.

Periodontium is a related term of periodontics.

As nouns the difference between periodontics and periodontium

is that periodontics is the study of supporting structures of teeth—gums, alveolar bone, cementum, and the periodontal ligament—and diseases and conditions that affect them while periodontium is the specialized tissues that both surround and support the teeth, maintaining them in the maxillary and mandibular bones; the tissues including alveolar bone, cementum, gums and periodontal ligament.