sheath vs cot

sheath and cot both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheath	Yes	No	No	No
cot	Yes	No	No	No

As nouns, cot is a hyponym of sheath; that is, cot is a word with a more specific, narrower meaning than sheath:

Other hyponyms of sheath include aglet, aiglet, fingerstall, holster, scabbard.

sheath (noun)	cot (noun)
a protective covering (as for a knife or sword)	a small bed that folds up for storage or transport
a dress suitable for formal occasions	baby bed with high sides made of slats
an enveloping structure or covering enclosing an animal or plant organ or part	a sheath worn to protect a finger