siamang vs lesser ape

siamang and lesser ape both are nouns.

Word	Noun	Adjective	Verb	Adverb
siamang	Yes	No	No	No
lesser ape	Yes	No	No	No

As nouns, lesser ape is a hypernym of siamang; that is, lesser ape is a word with a broader meaning than siamang:

siamang: large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web
lesser ape: gibbons and siamangs

siamang (noun)	lesser ape (noun)
large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web	gibbons and siamangs