founder vs buckle

founder and buckle both are nouns.

Word	Noun	Adjective	Verb	Adverb
founder	Yes	No	Yes	No
buckle	Yes	No	Yes	No

As verbs, buckle is a hyponym of founder; that is, buckle is a word with a more specific, narrower meaning than founder:

Other hyponyms of founder include go off, implode, crumple, flop, break, sink, slide down, slump.

founder (noun)	buckle (noun)
a person who founds or establishes some institution	fastener that fastens together two ends of a belt or strap; often has loose prong
a worker who makes metal castings	a shape distorted by twisting or folding
inflammation of the laminated tissue that attaches the hoof to the foot of a horse

founder (verb)	buckle (verb)
break down, literally or metaphorically	bend out of shape, as under pressure or from heat
sink below the surface	fasten with a buckle or buckles
stumble and nearly fall	fold or collapse
fail utterly; collapse