rotary vs circular

rotary and circular both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotary	Yes	Yes	No	No
circular	Yes	Yes	No	No

As adjectives, rotary and circular are synonyms defined as:

Other synonyms of rotary include orbitual.

rotary (noun)	circular (noun)
a road junction at which traffic streams circularly around a central island	an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa

rotary (adjective)	circular (adjective)
relating to or characterized by rotation	having the shape or form of a circle
describing a circle; moving in a circle	describing a circle; moving in a circle