metrification vs penning

metrification and penning both are nouns.

Word	Noun	Adjective	Verb	Adverb
metrification	Yes	No	No	No
penning	Yes	No	No	No

As nouns, penning is a hypernym of metrification; that is, penning is a word with a broader meaning than metrification:

metrification: writing a metrical composition (or the metrical structure of a composition)
penning: the act of creating written works

Other hypernyms of metrification include authorship, composition, writing.

metrification (noun)	penning (noun)
the act of changing from imperial units of measurement to metric units: meters, grams, seconds	the act of creating written works
writing a metrical composition (or the metrical structure of a composition)