gossamer vs cobweb

gossamer and cobweb both are nouns.

Word	Noun	Adjective	Verb	Adverb
gossamer	Yes	Yes	No	No
cobweb	Yes	No	No	No

As nouns, gossamer and cobweb are synonyms defined as:

gossamer (noun)	cobweb (noun)
a gauze fabric with an extremely fine texture	a dense elaborate spider web that is more efficient than the orb web
filaments from a web that was spun by a spider	filaments from a web that was spun by a spider
	a fabric so delicate and transparent as to resemble a web of a spider

gossamer (adjective)	cobweb (adjective)
characterized by unusual lightness and delicacy
so thin as to transmit light