valency vs powerfulness

valency and powerfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
valency	Yes	No	No	No
powerfulness	Yes	No	No	No

As nouns, powerfulness is a hypernym of valency; that is, powerfulness is a word with a broader meaning than valency:

valency: (chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)
powerfulness: possession of controlling influence

Other hypernyms of valency include power.

As nouns, powerfulness is a hypernym of valency; that is, powerfulness is a word with a broader meaning than valency:

valency: (biology) a relative capacity to unite or react or interact as with antigens or a biological substrate
powerfulness: possession of controlling influence

Other hypernyms of valency include power.

valency (noun)	powerfulness (noun)
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)	possession of controlling influence
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate
the phenomenon of forming chemical bonds