clew vs clod

clew and clod both are nouns.

Word	Noun	Adjective	Verb	Adverb
clew	Yes	No	Yes	No
clod	Yes	No	No	No

As nouns, clod is a hypernym of clew; that is, clod is a word with a broader meaning than clew:

Other hypernyms of clew include ball, chunk, clump, glob, lump.

clew (noun)	clod (noun)
evidence that helps to solve a problem	a compact mass
a ball of yarn or cord or thread	an awkward stupid person

clew (verb)	clod (verb)
roll into a ball