Symphalangus syndactylus vs siamang

Symphalangus syndactylus and siamang both are nouns.

Word	Noun	Adjective	Verb	Adverb
Symphalangus syndactylus	Yes	No	No	No
siamang	Yes	No	No	No

As nouns, Symphalangus syndactylus and siamang are synonyms defined as:

Symphalangus syndactylus and siamang: large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web

Other synonyms of Symphalangus syndactylus include Hylobates syndactylus.

Symphalangus syndactylus (noun)	siamang (noun)
large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web	large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web