chicken breast vs pigeon breast

chicken breast and pigeon breast both are nouns.

Word	Noun	Adjective	Verb	Adverb
chicken breast	Yes	No	No	No
pigeon breast	Yes	No	No	No

As nouns, chicken breast and pigeon breast are synonyms defined as:

chicken breast and pigeon breast: abnormal protrusion of the breastbone caused by rickets

chicken breast (noun)	pigeon breast (noun)
abnormal protrusion of the breastbone caused by rickets	abnormal protrusion of the breastbone caused by rickets