belay vs tubular device

belay and tubular device both are nouns.

Word	Noun	Adjective	Verb	Adverb
belay	Yes	No	Yes	No
tubular device	Yes	No	No	No

As nouns, tubular device is a hyponym of belay; that is, tubular device is a word with a more specific, narrower meaning than belay:

belay: something to which a mountain climber's rope can be secured
tubular device: a tubular or rectangular belay device, used for arresting the fall of a climber, and for rappelling.

Other hyponyms of belay include Sticht plate, auto-blocking belay device, guide plate.

belay (noun)	tubular device (noun)
something to which a mountain climber's rope can be secured	a tubular or rectangular belay device, used for arresting the fall of a climber, and for rappelling.

belay (verb)	tubular device (verb)
fasten a boat to a bitt, pin, or cleat
turn a rope round an object or person in order to secure it or him