espalier vs treillage

espalier and treillage both are nouns.

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

As nouns, treillage is a hypernym of espalier; that is, treillage is a word with a broader meaning than espalier:

espalier: a trellis on which ornamental shrub or fruit tree is trained to grow flat
treillage: latticework used to support climbing plants

Other hypernyms of espalier include trellis.

espalier (noun)	treillage (noun)
a trellis on which ornamental shrub or fruit tree is trained to grow flat	latticework used to support climbing plants