clenched fist vs manus

clenched fist and manus both are nouns.

Word	Noun	Adjective	Verb	Adverb
clenched fist	Yes	No	No	No
manus	Yes	No	No	No

As nouns, manus is a hypernym of clenched fist; that is, manus is a word with a broader meaning than clenched fist:

clenched fist: a hand with the fingers clenched in the palm (as for hitting)
manus: the (prehensile) extremity of the superior limb

Other hypernyms of clenched fist include hand, mitt, paw.

clenched fist (noun)	manus (noun)
a hand with the fingers clenched in the palm (as for hitting)	the (prehensile) extremity of the superior limb