perching bird vs Insessores

perching bird and Insessores both are nouns.

Word	Noun	Adjective	Verb	Adverb
perching bird	Yes	No	No	No
Insessores	Yes	No	No	No

As nouns, perching bird and Insessores are synonyms defined as:

perching bird and Insessores: a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists

Other synonyms of perching bird include order Insessores, percher.

perching bird (noun)	Insessores (noun)
a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists	a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists