fibril vs gossamer

fibril and gossamer both are nouns.

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

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

Other hyponyms of fibril include barb, cobweb, chromatid, myofibril, myofibrilla, sarcostyle, rhizoid, hypha, paraphysis.

fibril (noun)	gossamer (noun)
a very slender natural or synthetic fiber	a gauze fabric with an extremely fine texture
	filaments from a web that was spun by a spider

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