Hylobates syndactylus vs siamang

Hylobates syndactylus and siamang both are nouns.

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

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

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

Other synonyms of Hylobates syndactylus include Symphalangus syndactylus.

Hylobates 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