migrant shrike vs Lanius ludovicianus migrans

migrant shrike and Lanius ludovicianus migrans both are nouns.

Word	Noun	Adjective	Verb	Adverb
migrant shrike	Yes	No	No	No
Lanius ludovicianus migrans	Yes	No	No	No

As nouns, migrant shrike and Lanius ludovicianus migrans are synonyms defined as:

migrant shrike and Lanius ludovicianus migrans: a shrike of central North America; winters in Texas and the southern Mississippi valley

migrant shrike (noun)	Lanius ludovicianus migrans (noun)
a shrike of central North America; winters in Texas and the southern Mississippi valley	a shrike of central North America; winters in Texas and the southern Mississippi valley