fretwork vs treillage

fretwork and treillage both are nouns.

Word	Noun	Adjective	Verb	Adverb
fretwork	Yes	No	No	No
treillage	Yes	No	No	No

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

fretwork: framework consisting of an ornamental design made of strips of wood or metal
treillage: latticework used to support climbing plants

Other hyponyms of fretwork include trellis.

fretwork (noun)	treillage (noun)
framework consisting of an ornamental design made of strips of wood or metal	latticework used to support climbing plants