tendon of Achilles vs tendon

tendon of Achilles and tendon both are nouns.

Word	Noun	Adjective	Verb	Adverb
tendon of Achilles	Yes	No	No	No
tendon	Yes	No	No	No

As nouns, tendon is a hypernym of tendon of Achilles; that is, tendon is a word with a broader meaning than tendon of Achilles:

tendon of Achilles: a large tendon that runs from the heel to the calf
tendon: a cord or band of inelastic tissue connecting a muscle with its bony attachment

Other hypernyms of tendon of Achilles include sinew.

tendon of Achilles (noun)	tendon (noun)
a large tendon that runs from the heel to the calf	a cord or band of inelastic tissue connecting a muscle with its bony attachment