fibril vs chromatid

fibril and chromatid both are nouns.

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

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

fibril: a very slender natural or synthetic fiber
chromatid: one of two identical strands into which a chromosome splits during mitosis

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

fibril (noun)	chromatid (noun)
a very slender natural or synthetic fiber	one of two identical strands into which a chromosome splits during mitosis