formation vs metalwork

formation and metalwork both are nouns.

Word	Noun	Adjective	Verb	Adverb
formation	Yes	No	No	No
metalwork	Yes	No	No	No

As nouns, metalwork is a hyponym of formation; that is, metalwork is a word with a more specific, narrower meaning than formation:

Other hyponyms of formation include filing, forging, metalworking, granulation, grooving, rifling, turning.

formation (noun)	metalwork (noun)
the act of fabricating something in a particular shape	the activity of making things out of metal in a skillful manner
the act of forming or establishing something	the metal parts of something
creation by mental activity
a particular spatial arrangement
an arrangement of people or things acting as a unit
(geology) the geological features of the earth
natural process that causes something to form