Saxicola torquata vs stonechat

Saxicola torquata and stonechat both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saxicola torquata	Yes	No	No	No
stonechat	Yes	No	No	No

As nouns, Saxicola torquata and stonechat are synonyms defined as:

Saxicola torquata and stonechat: common European chat with black plumage and a reddish-brown breast

Saxicola torquata (noun)	stonechat (noun)
common European chat with black plumage and a reddish-brown breast	common European chat with black plumage and a reddish-brown breast