clamp vs C-clamp

clamp and C-clamp both are nouns.

Word	Noun	Adjective	Verb	Adverb
clamp	Yes	No	Yes	No
C-clamp	Yes	No	No	No

As nouns, C-clamp is a hyponym of clamp; that is, C-clamp is a word with a more specific, narrower meaning than clamp:

clamp: a device (generally used by carpenters) that holds things firmly together
C-clamp: a clamp in the shape of the letter C

Other hyponyms of clamp include bench clamp, cramp, pipe clamp, pipe vise, press.

clamp (noun)	C-clamp (noun)
a device (generally used by carpenters) that holds things firmly together	a clamp in the shape of the letter C

clamp (verb)	C-clamp (verb)
impose or inflict forcefully
fasten or fix with a clamp