As a noun capital

is capital.

As a proper noun yanjing is

(label) an ancient city located within present-day beijing, the capital of ji and yan.

As proper nouns the difference between ji and yanjing

is that ji is (historical) an ancient settlement in northeastern china within modern beijing while yanjing is (label) an ancient city located within present-day beijing, the capital of ji and yan.

As proper nouns the difference between yan and yanjing

is that yan is (historic) an ancient march, duchy, and kingdom of northeastern china during the zhou dynasty while yanjing is (label) an ancient city located within present-day beijing, the capital of ji and yan.

As a noun epithet

is a term used to characterize a person or thing.

As a proper noun yanjing is

(label) an ancient city located within present-day beijing, the capital of ji and yan.

As an adjective modern

is pertaining to a current or recent time and style; not ancient.

As a noun modern

is someone who lives in modern times.

As a proper noun Yanjing is

an ancient city located within present-day Beijing, the capital of Ji and Yan.

As a noun circle

is a two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from another point.

As a verb circle

is to travel around along a curved path.

As an adjective cycloidal is

pertaining to or resembling a cycloid; or a circle.

Cycloidal is a synonym of circular.

As adjectives the difference between circular and cycloidal

is that circular is of or relating to a circle while cycloidal is pertaining to or resembling a cycloid; or a circle.

As a noun circular

is a printed advertisement, directive, or notice intended for mass distribution; a flyer.

As nouns the difference between malapropism and goldwynism

is that malapropism is (uncountable) the blundering use of an absurdly inappropriate word or expression in place of a similar sounding one while goldwynism is any of a number of often-repeated malapropisms originally uttered by us film producer (1879-1974) or a malapropism reminiscent of goldwyn's utterances.

Leptin is a see also of ghrelin.

As nouns the difference between leptin and ghrelin

is that leptin is (hormone) a protein hormone produced in adipose tissue; it plays a role in regulating appetite and metabolism while ghrelin is (biochemistry) a peptide hormone, secreted in the stomach when empty, that increases appetite and secretion of growth hormone from the pituitary gland.

Obestatin is a see also of ghrelin.

As nouns the difference between obestatin and ghrelin

is that obestatin is (protein) an oligopeptide sequence, present in ghrelin, that binds to a specific orphan receptor while ghrelin is (biochemistry) a peptide hormone, secreted in the stomach when empty, that increases appetite and secretion of growth hormone from the pituitary gland.