cirrus vs tendril

cirrus and tendril both are nouns.

Word	Noun	Adjective	Verb	Adverb
cirrus	Yes	No	No	No
tendril	Yes	No	No	No

As nouns, tendril is a hypernym of cirrus; that is, tendril is a word with a broader meaning than cirrus:

cirrus: usually coiled
tendril: slender stem-like structure by which some twining plants attach themselves to an object for support

cirrus (noun)	tendril (noun)
a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile	slender stem-like structure by which some twining plants attach themselves to an object for support
a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
usually coiled