fibril vs myofibril

fibril and myofibril both are nouns.

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

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

fibril: a very slender natural or synthetic fiber
myofibril: one of many contractile filaments that make up a striated muscle fiber

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

fibril (noun)	myofibril (noun)
a very slender natural or synthetic fiber	one of many contractile filaments that make up a striated muscle fiber