gibbon vs lesser ape

gibbon and lesser ape both are nouns.

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

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

gibbon: smallest and most perfectly anthropoid arboreal ape having long arms and no tail; of southern Asia and East Indies
lesser ape: gibbons and siamangs

gibbon (noun)	lesser ape (noun)
smallest and most perfectly anthropoid arboreal ape having long arms and no tail; of southern Asia and East Indies	gibbons and siamangs