cleat vs calk

cleat and calk both are nouns.

Word	Noun	Adjective	Verb	Adverb
cleat	Yes	No	Yes	No
calk	Yes	No	Yes	No

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

cleat: a metal or leather projection (as from the sole of a shoe); prevents slipping
calk: a metal cleat on the bottom front of a horseshoe to prevent slipping

Other hyponyms of cleat include calkin.

cleat (noun)	calk (noun)
a strip of wood or metal used to strengthen the surface to which it is attached	a metal cleat on the bottom front of a horseshoe to prevent slipping
a fastener (usually with two projecting horns) around which a rope can be secured
a metal or leather projection (as from the sole of a shoe); prevents slipping