Dog Star vs Canicula

Dog Star and Canicula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dog Star	Yes	No	No	No
Canicula	Yes	No	No	No

As nouns, Dog Star and Canicula are synonyms defined as:

Other synonyms of Dog Star include Sirius, Sothis.

Dog Star (noun)	Canicula (noun)
the brightest star in the sky; in Canis Major	the brightest star in the sky; in Canis Major